In this article, quartz from different levels of the No. 11 ore vein of the Taoxikeng tungsten deposit in Gannan (southern Jiangxi province) has been analyized by neutron activation analysis. The result indicates that W has a close correlation with elements such as Sm, Lu, Yb, Mn, Sc, Ta and Fe. On the longitudinal projection plane, three concentrated centers can be distinguished at the levels of 156m and 106m respectively, and the W content has a rising trend from the surface to the deep which indicates the enrichment of the ore solution from southeast to northwest. This can suggest the promising prospecting in the deep of the Fenglingkeng deposit. Through the study on forecasting the deep reserves of the ore vein, it shows the reserves at the levels of 106m and 56m are 10275.6t, and the total reserves of No. 11 ore vein can reach 19851.93t if plus that at the levels from 156m to 356 m. This reserves is quite close to the proved reserves. Therefore, the data from neutron activation analysis can be helpful to the estimation on the deep reserves of the ore vein