Using such means as EMPA, SEM, XRD, IR, TG, XEDS and RAMAN, the authors studied the structure and composition of Tianhuang Stone from Changhua. The results show that the samples are dominated by cryptocrystalline texture and massive structure. The main minerals include dickite, kaolinite, and transitional minerals of kaolinite, dickite and alunite. The structure and composition are quite similar to those of Tianhuang stone from Shoushan. It is held that the yellowish massive stones which are composed of such kaolinite-group minerals as dickite, produced in slope wash materials and paddy fields, and consistent with six morality standards can be called Tianhuang Stone without exception.