The invention discloses a big data collecting and analyzing method applied to costume designing. The method comprises the following steps: 1, collecting user data, and storing the collected user data into a database; 2, collecting the sizes of garments with different brands and of different verities, analyzing the user data through a cloud computing platform, and selecting the size of the garment with the brand and the variety obtaining the best evaluation on the fitness from the user among the bought garments as the standard size; 3, manufacturing a paper pattern by adopting the standard size determined in the step 2, wherein the contour line of the outer edge of the paper patter conforms to the corresponding size of the standard size, and a second contour line corresponding to a second standard size is further arranged inside the contour line of the outer edge of the paper patter, an adhesive the same as that of a common double faced adhesive tape is arranged on the back of the whole paper pattern, and protective paper is arranged on the adhesive; 4, punching a plurality of holes in the second contour line; and 5, tearing down the protective paper, adhering the needed paper pattern to cloth, and cutting the cloth along the needed contour line.