The effect of different Se on Agaricus blazei Murrill,s agronomic traits by principal component analysis was studied. It can simplify into three effect principle components from the eight traits: cover thickness, cover weight, cover diameter, shank length, shank diameter, shank weight, flower weight, and yield. The results showed that the first principal component of agronomic traits and morphological effects factor can reflect the goal of the effects on the growth of Agaricus bazei Murrill in the concentration selenium. It was the expected effect and was the main referenced traits of the increased of Agaricus bazei Murrill. Based on the results, the training material after adding 30 mg/kg exogenous Se could produce the best effect.