Lamprophyres in the Taoyuan-Xiaotongjiapuzi gold ore belt is of strong enrichment type of incompatible elements ,with obvious fractionation among incompatible elements. The rock is concentratedly enriched with rare earth elements，and ∑REE values are (359.8-669.5)X 10-6，suggesting a strongly right-inclined LREE enrichment type. Comparative studies show that during the alteration of lamprophyre, K20, TiO2 and P205 were rather stable ,whereas Si，Ca Mg and Fe were evidently taken out or brought in. Moderate alteration generally did not cause obvious addition or removal of elements, with Nb, Zr and Y being especially stable.Geological-geochemical characteristics of rocks demonstrate that the rock was formed in an extensional tectonic environmem.