Abstract: To evaluate different forest management models ofPinus massoniana plantations at different stages, the authors tookPinus massoniana plantations of Dajiang Forest Farm in Qiyang, Hunan as a study object, studied the impacts of no disturbance management model, conventional management model and close-tonature management model on bio-diversity of undergrowth vegetation ofPinus massoniana plantation, by using the indicators such as the Margalef richness index (R ), Simpson index (D ), Shannon-Wiener index (H ′) and Pielou evenness index (E ) of undergrowth herb plantation. The results showed that: (1) at early and medium stage, the bio-diversity indexes of undergrowth herb ofPinus massoniana plantation (includingR ,D ,H ′ andE )followed an order as no disturbance management model＞close-to-nature management model＞conventional management model (P ＜0.05); (2) at later stage, theR ,D ,H ′ andE followed an order as close-to-nature management model＞conventional management model＞no disturbance management model (P ＜0.05). All the results indicated that according to forest growth stages and aims, suitable plans should be made in Pinus massoniana plantation management.