This paper introduces load pull technique and load pull automated test system in detail. The transmission line theory and terms referred to the design of automated tuner system were introduced in brief. 本文较为详细地介绍了负载牵引法和负载牵引自动测试系统,并对设计自动调配器所涉及到的一些传输线理论和术语作了简要的介绍。