Using such means as electron microprobe analysis, ICP-MS and ICP_AES， the authors studied the tremolite jade from Luanchuan tremolite jade deposit in the western part of Henan Province. The results show that the samples are almost exclusively composed of tremolite, and are quite similar to Hetian jade in chemical composition. It is held that this tremolite jade deposit is probably a magmatic hydrothermal replacement deposit.