The paper mainly studied the altitude of gneissic alkali-granite, rock structure, alkaline ferromagnesian, element geochemistry, genesis of zircon and zircon shrimp dating, eventually we drawed the conclusions: 1) Tuofeng and Niushan gneissic alkali-granite have the consistent characteristics with the sodium qualitative gneissic alkali-granite in rock forming minerals and rock chemical compositions: high silicon(SiO2=74.25％~77.08%), alkaline-rich(Na2O+K2O=7.7％~9.31％), high sodium(Na2O>K2O), low calcium(CaO=0.18%~0.39%)and contains aegirines. 2) Tuofeng and Niushan gneissic alkali-granite have the bedding structure (the strike of NE, the dip of SE), the rock-forming minerals of feldspar etc show the characteristic of crystallizing in solid-phase conditions, and most of the inherited zircons are magmatic and clastic zircons of different times. The characteristics imply that their original rock is sedimentary rock. 3)The result of zircons SHRIMP dating shows Tuofeng and Niushan gneissic alkali-granites formed at late triassicepoch and the times of original rock is not earlier than the palaeozoic.