Abstract: Shuiquangou complex is of magmatic origin aged Indosinian epoch. The depth of the intrusive emplacement ranges 2~3km. Four associations and their types of rocks are newly devided. The petrochemical study on the whole complex proves that it is a potassic and highpotassic complex consisting of calc-alkaline, weakly-alkaline and alkaline complex. The diagrams of their petrochemical variation show that the magma has two evolutionary trends:one is acid evolutionary trend (pyroxene diorite→amphibole monzonite→quartz alkali-feldspar syenite→alkali-feldspar granite), the other is alkaline evolutionary trend (syenite→aegirineaugite syenite→alkali-feldspar syenite). Its internal evolutionary mechanism is also probed simply.