Based on the analysis of product development process, product design quality evaluation system is summarized. It is established with the improvement model for generalized quality. It is multi-angle and multi-level assessed with the general ized quality byusing various evaluation methods. By the synthesis utilization of 4 kinds of evaluation methods, before-and-after data and the experience about the product design, product manufacturing and product management are contrasted. Taking a compressor as an example, the effect is described for product design quality evaluation system.