In this paper, we use the least squares estimation and principal component analysis to analyze the performance impact of manganese and chromium to hot-rolled ribbed steel bars, eliminate collinearity and establish the linear regression equation of manganese and chromium with steel yield strength. In the fitting result, the proportion of carbon and manganese is consistent with practical experience, and the correlation of sulfur and the yield strength is still a problem. The fitting result can provide a reference for analyzing the performance of hot-rolled ribbed steel bars. However the nonlinear relationship of manganese and chromium with hot-rolled ribbed steel bars has not been resolved, we need to further analyze.