In this paper the designing principle and the technical characters of a broadband microwave power transistor amplifier for the solar radio fast recording system at Yunnan observatory are described. The circuit schemes and the initial results measured for the amplifier are included. 本文介绍了云南天文台微带功率晶体管放大器在太阳射电快速记录系统中的设计原理和技术性能,并给出了放大器的线路图和最初的测量结果。