Thirty-seven new K-Ar ages are reported for minerals from some veintype tungsten deposits and for igneous rocks in south China. The intrusion ages range from 183.1 Ma to 99.5 Ma(except one of 715.6 Ma), most of them about 150 Ma with isochron age of 132.1 Ma, placing them in early Jurassic to Cretaceous in age. The ages of the intrusions associated with tungsten mineralization are getting younger from the central part to the margines in the South China tungsten province. The mineralizations associated with these intrusions, dated by vein-mica, occurred so closely in time with the various intrusions, it cannot be meaningfully separated by K-At dating, although in most cases appears to be slightly younger. Mineralization is essentially penecontemporaneous with intrusion. As a result of that the initial (40)Ar/(36)Ar ratio of intrusions is much higher than that ratio of present atmospheric argon, so it is suggested that there was excess of radiogenic argon in existence during the intrusions were formed.