During the development of agricultural intensification,the biodiversity had been affected.The causes of biodiversity extinction were that the application of chemical fertilizers and pesticides,enlarging of farm land,monoculture of cropping systems and destroy of agricultural environments.On the other hand,the agricultural intensification increased agricultural products,so the areas of wasteland reclamation decreased.Meanwhile,the biodiversity of soil could be raised by the crop straws returning the arable land.At last,the countermeasures were put forward to maintain the biodiversity.