X-ray diffraction method was employed to analyze twelve Tianhuang samples, which include one Qingtian Stone sample, nine Shoushan Stone samples and two Changhua Tianhuang Stone samples. The results show that Qingtian Stone consists of pyrophyllite（58%）, sericite (36.1%) and kaolinite (5.9%), Changhua Tianhuang Stone is composed of dickite, and Shoushan Stone is comprised respectivelyof dickite, kaolinite, pyrophyllite and sericite.