The quality interaction relationship in the automatic assembly process of a missile was discussed.The data were divided into types,the continuous variables in the assembly process were analyzed by Pearson correlation,and the grey correlation analysis method was used for comparison and verification.The contingency analysis of discrete variables was carried out,and the correlation was visually displayed by using the corresponding analysis diagram.Then,through the correlation analysis results of the assembly process data,the upstream process indicators B1 and m1 should be improved,so as to greatly improve the quality of the downstream process B2.For the key process h,a more significant assembly quality improvement effect could be obtained through the strict control of the parts batch and the guidance and training to the assembly workers.Finally,the correlation analysis software was designed to lay the foundation for the improvement of acquisition means,comparison and verification before and after,and data fusion analysis.