Abstract: Taking the Lianhua Mountain in Ya'an as an area,the effect of human disturbance was investigated on community structure and species diversity of Pinus massoniana planatation forest by typical plots methods.The results showed that a total of 127 vascular plant species were recorded,belonging to 76 families and 94 genera.The sum was the lowest in diameter class and height class of tree layer under slight human disturbance.With intensifying disturbance,the diversity indices were on the decrease in tree,shrub and herb layers.And the species diversity was the highest in shrub layer.Therefore,it was suggested that the intense human disturbance would lower the level of the community structure and species diversity of P.massoniana planatation forest.Measures should be taken to protect the forest.