K\|feldspathization of Hadamengou gold deposit in the Inner Mongolia is most prominent. Based on the studies of geological features and physical\|chemical condition of K\|feldspathization, the authors point out that the alteration of Hadamengou gold deposit is K\|feldspathization, not quartz\|sericitization. The reason is that the deposit occurs in the condition of high depth, high temperature, high alkaline components, high oxygen fugacity and m (K\ )/ m (H\ ) ratio. Among them, m (K\ )/ m (H\ ) ratio took an important part in K\|feldspathization. According to K\|feldspathization altered feature and physical\|chemical quality of acidic and alkali component, we include vertical zoning of wallrock alteration(mineralization) of the hydrothermal gold deposit from lower to upper is K\|feldspathization(veinlet\|disseminated type ore)\|phyllic alteration(altered rock type ore)\|silicification(quartz vein type ore). This altered zoning pattern plays an important role in prospecting for gold deposits.\;