Interior Decoration Method Technical Field The present invention relates to an interior decoration method, and 5 particularly to an interior decoration method involving surface-decorative materials used for suspended ceilings, surfaces of walls or pillars, and ground surfaces. Background Art Now interior decoration materials are classified into two kinds: 1, base 10 material, such as, various specifications of gypsum boards, ETERPAN and wooden plywoods; and 2, surface-decorative material, such as various specifications of ceramic tiles for a wall or floor, mosaics, natural marbles, granites, man-made stones and the like, and various specifications of solid wooden flooring, engineered wooden flooring and artificial plastic flooring. 15 During interior decoration, the base material is wasted at the proportion of 8%-10%, and the surface-decorative material is wasted at the proportion of 3%-6%. A common phenomenon is that the decoration site is dirty and in disorder. Such a primitive and backward decoration method must be abolished, since cutting sound is made from machines, the room is full of dust 20 and noise is very loud. Disclosure of the Invention An object of the present invention is to provide an interior decoration method. In order to achieve the above object, technical solutions used in the present 25 invention are as follows. Specific operating procedures include: 1. measuring a flatness of a ceiling surface, a wall or pillar surface, and a ground surface, and a square equilateral positioning, a cross positioning and a diagonal positioning; 30 2. setting out and lofting according to design requirements; 3. cutting, categorizing and packaging a base material in sequence; 4. arranging surface-decorative materials according to specifications of the setting-out and lofting; 5. transporting the base materials to the site and arranging and assembling 35 in sequence; and 1 6. placing the surface-decorative materials in sequence at the site and assembling the same according to the sequence number. 1. the base materials and the surface-decorative materials for a ceiling are positioned for being mounted onto a ceiling, with the steps as shown in Fig. 1: 5 1) measuring a square positioning, a cross positioning, and a diagonal positioning of the ceiling surface; 2) setting out and lofting according to design requirements; 3) cutting, categorizing, and packaging base materials in sequence; 4) organizing the surface-decorative materials according to the 10 specifications of the setting-out and lofting; 5) transporting the base materials to the site and arranging and assembling the same in sequence; and 6) placing the surface-decorative materials in sequence at the site and assembling the same according to the sequence number. 15 II. the base materials and the surface-decorative materials for a wall or pillar surface are positioned for being mounted onto the wall or pillar surface, with the steps as follows, shown in Fig. 2: 1) measuring the edge-length positioning, the vertical positioning and the diagonal positioning of the wall or pillar surface; 20 2) setting out and lofting according to design requirements; 3) cutting, categorizing, and packaging the base materials in sequence; 4) arranging the surface-decorative materials according to specifications of the setting-out and lofting; 5) transporting the base materials to the site and arranging and assembling 25 the same in sequence; and 6) placing the surface-decorative materials in sequence at the site and assembling the same according to the sequence number. Ill. the surface-decorative materials for a ground surface are positioned for being paved on the ground surface, with the steps as follows, shown in Fig. 3: 30 1) measuring the edge-length positioning and the vertical positioning and the diagonal positioning of the ground surface; 2) setting out and lofting according to design requirements; 3) cutting, categorizing, and packaging the base materials in sequence; 4) arranging the surface-decorative materials according to the 35 specifications of the setting-out and lofting; 2 5) transporting the base materials to the site and arranging and assembling the same in sequence; and 6) placing the surface-decorative materials in sequence at the site and assembling the same according to sequence numbers. 5 The beneficial effects of the interior decoration method of the present invention lie in the following aspects: the problem of noise pollution during the decoration is solved; a large amount of decoration waste is not produced; no dirty and disorder phenomenon appears; decoration achievements are easy to be maintained; the operation is safe, environmentally friendly, and fast; 10 waste of the base materials and the surface-decorative materials is reduced; and utilization rate of raw materials is improved. Brief Description of Drawings Below, the present invention is further described, in conjunction with figures and embodiments. 15 Fig. 1 is a schematic view of the positioning of a ceiling; Fig. 2 is a schematic view of the positioning of a wall or pillar surface; Fig. 3 is a schematic view of the positioning for being paved on a ground surface; and Fig. 4 is a schematic view of mounting process of the present invention. 20 Detailed Description of Embodiments As shown in Fig. 1, the base materials for a physical ceiling surface can be mounted and positioned particularly based on length and width of the ceiling surface, in conjunction with design requirements, wherein a mounting center expansion seam of object material is of 3-5 mm, and an edge expansion 25 seam is of 6-8 mm. The surface-decorative materials for the physical ceiling surface can be positioned based on the method shown in Fig. 1, wherein adjustment is made by combining the practical site and the design requirements, so as to meet a construction technical standard required by the decorative design. Depending 30 on the design, the mounting of the surface-decorative materials needs center seams, wherein a gap is formed between the seams or the seams are located together with each other with no gap therebetween, the edge expansion seam is of 3-5 mm, and the finished surface in appearance has a gap of 0.5-1 mm. 35 In the case of a ceiling surface in round, oval, arched, or peculiar shape and the like, the base materials are subjected to the measurement, setting-out and positioning and divided according to the physical object 3 on-site, in combination with design requirements, so as to complete the mounting of the base materials. In the case of a ceiling surface in round, oval, arched, or peculiar shape and the like, based on practical objects on-site and in combination with 5 design drawings, when meeting the design requirements, the surface-decorative materials are positioned, set out and lofted according to the volume of the practical object, and divided and/or assembled, or the mounting method may be determined based on the volume of the object. Depending on the design, the mounting of the surface-decorative materials 10 needs center seams, wherein a gap is formed between the seams or the seams are located together with each other with no gap therebetween, the edge expansion seam is of 3-5 mm, and the finished surface in appearance has a gap of 0.5-1 mm. As shown in Fig. 2, positioning height and width of a wall or pillar is made 15 according to practical objects, such as the wall and the pillar, and the design requirements, for performing the positioning, setting-out and measurement in combination. The setting-out process of wooden base and surface-decorative panels is different from that of ceramic tiles for a wall or floor, natural marbles, man-made stones, natural granites. The measurement of the width and 20 thickness of the wall or pillar surface has an precision error of 1-1.5 mm. The wooden base decorative materials for the wall or pillar may be mounted and positioned based on the height and width of the wall or pillar, and the practical measurement, setting-out and positioning on-site are performed in combination with the design requirements, wherein a mounting 25 center expansion seam of the base materials of the objects is of 3-5 mm, and an edge expansion seam is of 6-8 mm; the base materials of the objects, such as a wall, concave corner, and convex corner, are mounted evenly, wherein a vertical precision error is 1-1.5 mm. During mounting wooden surface-decorative materials for a wall or pillar, 30 taking the practical site and the design requirements into consideration, a construction technical standard is established for meeting the decorative design requirements. Depending on the design, the mounting of the surface-decorative materials needs center seams, wherein a gap is formed between the seams or the seams are located together with each other with no 35 gap therebetween, the edge expansion seam is of 3-5 mm, and the finished surface in appearance has a gap of 0.5-1 mm, concave corners and convex corners of the wall or pillar surface are level, and the vertical precision error is 1-1.5 mm. During mounting surface-decorative materials for the wall or pillar, ceramic 40 tiles for a wall or floor are tiled firmly, with the gap between the center seams always being of 0.5-1 mm unless the design requirements define otherwise. The gap of the finished surface in appearance is of 0.5-1 mm, concave 4 corners and convex corners of the wall or pillar surface are level, and the vertical precision error is 1-1.5 mm. During mounting surface-decorative materials for a wall or pillar, in the case of natural marbles, granites, and man-made stones, depending on the design, 5 it needs center seams, wherein a gap is formed between the seams or the seams are located together with each other with no gap therebetween, and the finished surface in appearance has a gap of 0.5-1 mm. The concave corners and convex corners of the wall or pillar surface are level, and the vertical precision error is 1-1.5 mm. 10 When a wall or pillar is in round, oval, specific shape and the like, during mounting the surface-decorative materials, the positioning, setting-out and lofting are performed based on the practical objects on-site, in combination with the design drawings, meeting a design appearance requirement. Depending on the design, it needs center seams, wherein a gap is formed 15 between the seams or the seams are located together with each other with no gap therebetween, and the finished surface in appearance has a gap of 0.5-1 mm. The concave corners and convex corners of the wall or pillar surface are level, and the vertical precision error is 1-1.5 mm. In the case of an independent single pillar, during mounting the so-called 20 individual surface-decorative materials, the positioning, setting-out and lofting are performed based on the practical objects on-site, in combination with the design drawings, meeting a design appearance requirement. Depending on the design, it needs center seams, wherein a gap is formed between the seams or the seams are located together with each other with no gap 25 therebetween, and the finished surface in appearance has a gap of 0.5-1 mm. The concave corners and convex corners of the wall or pillar surface are level, and the vertical precision error is 1-1.5 mm. As shown in Fig. 3, based on the practical ground, considering the functional arrangement of the design drawings, the edge positioning, the 30 center positioning and the diagonal positioning are performed, under the situation of meeting the design requirements, and a variety of shapes and a variety of specifications of hard and soft paving materials are measured. During mounting surface-decorative materials for a ground surface and various hard materials, depending on the design, it needs center seams, 35 wherein a gap is formed between the seams or the seams are located together with each other with no gap therebetween, and the edge expansion seam is of 5-7 mm. The flat surface has a right-angle appearance gap of 0.5-1 mm. The local ground flat surface of the object has the precision of 1.5-2 mm. 5