The AM has a wide applications in communication system. At present it is divided into high level and low level AM. In view of traditional implementation method about low level AM, it has the advantage of design flexibility and principle simplicity, but its debugging is complex. It propose the design method of low level AM. According to the magnetization of amorphous metal. the working principle and fabricate technics of voltage controlled inductor are described. The circuit diagram of AM and magnetization inductor are given, its working principle is introduced. Through experimental verification, the AM has the advantage of excellent performance,good linearity and high sensitivity. It has novel innovation and create a new design direction about AM.