The invention relates to a systematic design method of an embedded type module cross test. The method includes the following steps that firstly, all modules in an embedded type system are classified or sorted, and a complete inter-module cross correlation matrix is built; secondly, according to the first step cross test use case reduction strategy, specific modules involving the in-pair cross and module categories are analyzed and determined to obtain an original cross test use case set; then, according to the second step cross test use case reduction strategy, analysis and reduction are further conducted on the original cross test use case set, and a preliminary cross test use case set is obtained; finally, the cross depth and intensity of each cross test use case in the preliminary cross test use case set is analyzed and selected, and a final cross test use case set is obtained. The good systematic test design guarantees the quality of the specific test implementation in the next stage, also reduces the workload of the final test implementation, and makes the 'fast and good' advantages of the cross test embodied.