本文通過對BJT和FET工作原理和結構的分析及類比，將BJT構成的放大電路的分析方法通過一定的變換直接用于FET構成的放大電路的分析。這樣將BJT放大電路和FET放大電路的分析方法統一起來，實現僅僅使用BJT放大電路的一套分析方法完成兩種放大電路的分析和計算，可以簡化FET放大電路的計算。
關鍵詞：BJT；FET{放大電路；化歸分析方法

Abstract：Through the analysis and comparison of the operation principle and structure of BJT and FET，the paper introduces that the way of analyzing the amplifying circuit composed of BJT can be applied in the analysis of the circuit composed of FET by means of some changes．Then the method of analyzing BJT amplify circuit and FET amplify circuit can be united as one．And the analysis of the two kinds of amplify circuit can be realized by the method of BJT analysis only：Based on this method，the caculation of FET amplify circuit is simplified．
Keywords：BJT；FET；amplify circuit；analysis method