Abstract: Due to the diffusion effect of knowledge, teamwork gradually dominates the knowledge production process in most technical fields. Describe the characteristics and models of scientific collaboration has become the focus of scholars at home and abroad. However, whether collaborative research can produce patents with higher quality requires further testing. Based on the patent data authorized by USPTO of China and other seven economies from 1975 to 2017, this paper compares and analyzes the characteristics of patent quality and evolution trend in various economies, and uses Poisson model to empirically study the inventor collaboration on the patent quality in China. The study shows that, compared with non-collaboration, firstly, the inventor collaboration can effectively improve the patent quality. Further, international collaboration of inventors has a significantly higher effect than the domestic. Secondly, the inventor collaboration between China and the United States has the most obvious effect on the improvement of patent quality, while the contribution from collaboration with Japan and Germany is relatively small, and the collaboration with Taiwan can effectively promote the accumulation of forward citations. Thirdly, the corporate-university and corporate-research institutes collaboration exhibit the largest positive impacts on patent quality, while the inter-corporate collaboration can effectively promote the accumulation of patents' forward references, but inhibit the increase in the number of claims. In addition, the other configurations include at least one university or research institute have no positive impact on patent quality.