当前，在专利申请量激增和技术快速更新的背景下，包括我国在内的全球主要国家的专利系统均面临日益严重的审查积压挑战。本文以2003年我国发明专利申请数据为分析样本，利用生存分析的方法，对我国发明专利审查周期的影响因素进行了分析。分析发现，IPC分类数、专利引文数、申请来源国是影响我国发明专利审查周期的保护因素，而权利要求数是危险因素。为此，本文提出可以通过设定准确界定IPC分类的义务、提高引文标准、提高权利要求附加费标准、实现差异化的政治倾向等措施提高我国专利授权系统的运行绩效。

In the background of rapid growth of patent application and quick technology innovation, most countries’ patent systems are facing increasingly serious challenge of patent grant delay, China as well. This paper has analyzed the influencing factors of China’s invention patent examination period by using the method of survival analysis and China’s invention patent data in 2003, and discovered that the protection factors affecting time-lag of China’s invention patent grant include the number of IPC, the number of patent citation and origin country of patent application, while the number of patent claim is a hazard factor. Therefore, this paper has proposed many measurements including to establish the duty of exactly defining IPC, to raise the level of citation and additional fee of the claims and to implement differentiated political propensity for improving performance of China’s patent examination system.