Jinbiansi deposit is located in the southwest margin of Qinsanbu rock mass which is in the east section of Longshoushan Mountain, where there are a series of uranium occurrences with a good metallogenic setting. The paper studied the magmatic condition, structure condition, hydrothermal condition, subsequent transformation condition, especially the alkali metasomatism which had a close connection with the formation of U ore body. It is great significant for the future prospecting of uranium deposit.