Abstract: Based on the basic model of inductor,this paper firstly presents an equivalent circuit of planar rectangular inductor,and analysis its characteristics,as well as the formula for calculating;secondly,curves of the inductor characteristics varying with frequency are got by MATLAB and verified by the 3D electromagnetic simulation software HFSS;lastly,this paper discusses the characteristics of planar rectangular inductor based on LTCC technology,as well as the influence of different parameters on its characteristics.