本文给出了一种新型二冲程汽油机的设计方案，并对其进行了计算分析和优化设计。主要特点为：采用顶置气门进气、纯空气扫气、气口排气的换气方式；采用混合气喷射的供油方法；合理利用排气波动效应。模拟计算表明，新机在降低油耗、提高动力性方面均得到了较好的效果。 This paper presents a new two-stroke gasoline engine design, and its calculation and analysis and optimization design. The main features are: the use of overhead valve intake, pure air scavenging, air vents ventilation mode; the use of mixture jet fuel supply method; rational use of exhaust fluctuations effect. The simulation results show that the new machine has achieved good results in reducing fuel consumption and improving power.