Apatites from syntectic granitoids are characterized by their rather perfect crystallization, relative density(3.103-3.141)，microharchiess(442一461 kg/mm2) and peculiar contents of some elements; Cu 1970-2373 ppm, Pb 292.92-480 PPm, F 25367-38950 ppm, Cl 2917一4798.75 ppm. In contrast, apatites from the transformation granitoids have relative densities 3.142-3.165, microhardness 461-483 kg/mm2, Cu 12.8-23.4 ppm, Pb 260-306 ppm, F 42400-75000 ppm, Cl 95-438 ppm, and relatively rich REE.In addition, apatites from the transformation granitoids have somewhat higher infrared spectroscopic data (1050一1046 cm(-1) than those from the syntectic granitoids(1048一1044 cm(-1)， 602-601 cm-1.The initial 87Sr/86Sr ratio of apatites from syntectic granitoids is 0.70564-0.70566 while that of apatites from the transformation granitoids is 0.72116. From the above discussion, we may reach the conclusion that these two types of granitoids had different source materials and were formed under different physical-chemical conditions, i. e., the magma of the syntectic granitoids came from greater depth while the magma of the transformation granitoids was a kind of remelting magma derived from crustal materials.