A TL sensitivity change can usually be observed after the quartz sample is heated to a high temperature. The change of 110 o C TL peak or PTTL was reported to be an increase in many studies. The change of TL sensitivity of other TL peaks, mainly 150 and 375 o C, with annealing treatments was demonstrated in this study. Two types of TL sensitivities in granitic quartz were found. One type is the low temperature TL sensitivity (<250 o C) which increases with annealing time and temperature. Another type is the high temperature TL sensitivity (>250 o C) which usually decreases after annealing. If the TL sensitivity is a measure of the population of associated TL traps, the trap population is a potential geochronometer to date a cooling age of a granite host.