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A Stirling cycle engine is very suitable for the recovery of exhaust heat downstream turbine, as it has many favorable characteristics, such as high efficiency, less pollution, silent operation, high reliability, simple configuration and multi-fuel capability. Firstly, the 1.5T gasoline engine exhaust temperature testing experiment is presented, and the downstream turbine exhaust temperature is analyzed. Secondly, according to the range of the exhaust temperature and energy losses of the gasoline engine, the basic structure and operating parameters of the Stirling cycle engine are designed. Finally, a mathematical model of the Stirling cycle engine considering the heat losses and friction losses of the heat exchanger is developed, which is used to simulate the exhaust heat recovery system of gasoline engine. The simulated results are appropriate to evaluate the performance of designed Stirling engine. So it is feasible to recycle the exhaust heat of gasoline engine using a Stirling cycle engine.