There are some problems in using traditional‘size-limits control method'to control the quality of the mating-parts

the anlaysis of a sample shows that this traditional method may cause a decreasing of the fit-rate when the size distribution of the mating-parts is non-Gaussian distribution. A method combining ‘probability analyzing'and‘point-to-point graphs of tolerance center control'is proposed to solve the existing problems in this paper

which makes statistical analysis for the size of the mating parts

draws distribution curve to instruct the subsequent production and uses ‘point-to-point graphs of tolerance center' to control process quality. And also a workshop-oriented application program is obtained to assist the process of quality control in site.