Due  to the organization of the fabric used , yarn arrangement , special raw  materials and the number of yarn , yarn density , and yarn twist and  twist to the structure and methods of finishing yarn varies. Therefore, the formation of the fabric are not the same in appearance .
For  production, innovation or imitation products , we must grasp the fabric  structure and fabric of the local technical conditions and other  information. To do this we must be attentive to the fabric and detailed analysis in  order to obtain correct results of the analysis , design , alteration  or imitation fabric to provide information.
In order to obtain more accurate analysis results , prior to analysis to analyze projects and their sequence . During the operation to be careful and to try to save swatches materials used in the analysis of the conditions are met .
Fabric analysis is generally performed in the following order .
A : Sampling
When  analyzing the fabric , the accuracy of the information with the  sampling location , the size of the sample area , and thus the sampling  method should be a requirement. Since many varieties of fabric , big difference between them , so in  practical work to select the sample should be based on the specific  circumstances.
( A ) sampling location
After  the fabric under the machine, due to a balancing role in the fabric  weft yarn tension , the width and length are slightly changed. This  change will cause the fabric edge and central , as well as the density  of the two ends of the fabric there are differences . Also  in the dyeing process, change the fabric ends and the middle of the  resulting edge is also not the same , in order to make the data measured  with accuracy and representativeness of the general provisions : When  sampling from a whole piece of fabric , the sample selvage distance to not less than 125px, distance from the ends of not  less than 1.5-3m in the cotton fabric ; wool fabric on not less than  3m; silk fabric in about 3.5-5m.
In addition , the sample should not be with a significant defect , and  seeks its original natural state in order to ensure the accuracy of the  analysis results .
( B) the sample size
Sample size, should vary with the type of fabric , structure varies . Because  the fabric is consumed test analysis should be based on the spirit of  conservation , to ensure the correct analysis of the data provided , and  strive to reduce the size of the sample. Fabric sample simple organization can get smaller, usually 375px * 375px. Larger organizations loop color fabric can take 500px * 500px. Large fabric color cycle ( eg sheets ) should at least take a yarn loop area occupied . For  Jacquard ( such as quilt , carpet ) because of its large number of warp  and weft loop , part of the organizational structure of the general  analysis to a representative . Thus , generally taken to be 500px * 500px, or 625px * 625px. If the sample size is small , just slightly larger than 125px * 125px can be analyzed .
Two : Make sure the fabric sides
When swatches analytical work , we should first determine the front and back of the fabric .
Sides of the fabric is to be judged according to their general appearance effects. Here are some commonly used method to judge .
A general positive pattern fabric , color and clear and beautiful than the opposite .
2 color molding plants and floral pattern fabric with its front appearance of the grid must be clear and pleasing .
3 ribs and pique , front close and delicate, with a strip or embossed  pattern , while the opposite is rough, have longer floats .
4 fluff fabric : single-sided pile fabric , which is a positive side effect plush fabric . Double-sided plush fabric from , then the fluff clean, tidy side is positive .
5 observations fabric selvage : If selvage smooth, neat front side of the fabric .
6 double, multi-layered and multi- fabric , such as the front and back  of the warp and weft density is not the same , it is generally positive  with greater density or positive material better .
7 Leno : clear lines twisted by highlighting the positive side of the fabric .
8 towel fabric : terry density to one side of the front .

Most  of the fabric of its positive and negative significant difference, but  there are many sides of the fabric very similar , both sides can be  applied. Therefore, the difference between this type of fabric may insist their positive and negative .
Three : Make sure the fabric warp and weft
In decision after both sides of the fabric , you need to determine in  which direction the fabric is warp and weft direction which this  analysis of the fabric density , the number of warp and weft and weave  and other special items , it is a prerequisite .
Mainly based on the difference between the warp and weft of the fabric below.
1 If the sample to be analyzed is the selvage of the fabric , then the  fabric edge is parallel to the warp yarn , and fabric edge is  perpendicular to the weft .
2 parts of a slurry containing the warp , the weft -free pulp parts .
3 large party is generally warp fabric density , low density smaller one for the weft .
4 reed marks obvious fabric , the fabric of the reed to mark the direction of the warp .
5 the fabric is a group of several yarn strands , while the other  group is a single yarn , the warp strands generally , as the weft yarn .
6 If the yarn twist yarn fabric is not the same , then the Z -twist yarns of the warp , S -twist yarns of the weft .
7 If the fabric is not the same yarn twist , the twist of a large majority of the warp , twist small zonal .
[8] The warp and weft fabric tex , twist , twist are insignificant, the yarn evenness, good gloss warp
9 . Towel fabric , yarn as its starting terry warp yarns as weft terry afford .
10. Sliver sliver of fabric which is usually the warp direction .
11 If the fabric yarns have a number of different systems with the number of bits when compared to the warp direction .
12. Leno has twisted warp yarn , twisted yarn as weft no .
13  interwoven in different materials , the general exclusion cotton woven  cotton fabrics , cotton warp ; . Wool silk interwoven fabric , the silk  warp ; wool cotton interwoven fabric , then silk, cotton warp ; natural  silk and silk pay fabric , natural silk warp ; natural silk and rayon interwoven fabric , then natural silk warp .
Because the fabric highly versatile . Textile  raw materials and thus requires organizational structure is varied , so  the judgment, but also be determined according to the specific  circumstances of the fabric.