Patent quality evaluation can identify high-quality patents from numbers of patents, which can assist enterprises to grasp the overall situation of technology development, focus on the direction of research and development, and optimize new product development program. In this paper, methods of patent quality evaluation are systematically reviewed and their advantages and disadvantages have been compared. In terms of the ambiguity and indirect measurement of patent quality, two proxy variables are given to represent the patent quality based on the analysis of the high-quality patents’ features. As a result the research plan of patent quality evaluation model based on litigation patent data is proposed. In the part of empirical study, the patent quality evaluation model of pacemaker is constructed, and the applicability of the model is verified by transfer of patents. Finally, the evaluation results of patent quality in pacemaker are given.