The planting width of spring corn and spring soybean interplanting, density of spring corn and spring soybean were studied by designs of regression with orthogonal, rotable and composite and setting field parameter test. The second-order regression models were established about the total yield of spring corn and spring soybean interplanting yield of spring corn, yield of spring soybean and net value by analyzing the test results. The planting width of spring corn and spring soybean interplanting and the compound group constitution were perfected by factor efficiency analysis and computer simulation perfecting in the base of models.