Silicon oil fan clutch has many merits such as saving energy, mitigating yawp, keeping temperature and enhancing the life of engine. This paper analyzes the factors that affect the performance of silicon oil fan clutch and optimizes the key configuration. A kind of silicon oil fan clutch has been developed, performance and experimental data of silicon oil fan clutch are summarized through bench testing. The test results show that the optimized clutch can make a rapid response to temperature and has less consumption of power.