This paper introduces and analyzes briefly the composition and unique technical principle and using effect of a highpressure direct injection system ( HPDI System ) which is introduced in the end of 1990s by Westport Innovations Inc., Canada. 对加拿大西港公司在20世纪90年代末推出的高压直喷系统(简称HPDI系统)的组成、独特的技术原理及试用效果等方面进行了简要的介绍和分析。