Study of several terrestral Permian-Triassic bounday sections in the eastern Yunnan-western Guizhou area shows that ther commonly occur 1~2 horizons of claystones of non-normal event origin near the Permian-Triassic boundary. Many microspherules have been first found in the claystones. According to their chemical compositions, the microspherules can be divided into two types: siliceous and baritic. Writers considered that this claystone with the microspherules must be formed by co-sedimentation of normal sediments and the volcanic clast. The volcaism was coused by collision of meterorite and the earth. The microspherules is one of the products formed in collision.