Abstract: For the identification of cashmere, the statistical regularities of scale pattern genetic code under optical microscope are studied. These results show that fiber diameter is even and its coefficient of variation smaller than that of other scale pattern gene codes. Among all scale pattern gene codes, the optimal fitting of scale rectangle factor follows normal distribution with a correlation higher than 0.96 and that of all other shape parameters follow lognormal distribution with a correlation higher than 0.99. Further comparisons show that among all scale pattern gene codes, the dispersion of relative shape parameters is smaller than that of absolute shape parameters. The dispersion in scale rectangle factor is smallest and largest in scale area. More scale look like a square or narrow rectangle. These statistical characteristics give us a reference in finding an optimal gene group for the identification of cashmere and also lay a theoretical foundation in developing the identification principal of cashmere.

Key words: cashmere, scale pattern gene code, normal disterbution, lognormal distribution