Recently, computer aided circuit analysis(CAA) has been an important aspect in circuit teaching innovation. To solve the problem that it is always fussy to calculate complex circuit in circuit course and used to face many real difficulties in programming when using computer language to aid circuit analysis, this paper uses MATLAB to calculate complex circuit, giving two circuit examples. It shows MATLAB can work effectively in circuit calculation and the purpose of this paper is to promote the farther teaching innovation of circuit course by introducing MATLAB.