The Liuyuan granitoid, associated with eclogite, serves as a key to understand the regional tectonic evolution. U-Pb single zircon gives an upper intercept age of 880±31Ma. The REE pattern shows LREE-enriched and Eu negative anomaly, and the whole-rock sample givesεNd value of -0.9 at 880 Ma and Nd model age of 1530 Ma related to a depleted mantle. The authors conclude that the Liuyuan granitoid crystallized at Neoproterozoic of 880 Ma and was derived from a source composed of the mixture of a deep-seated Paleoproterozoic crust-derived (probably 1800~2200Ma) and a mantle-derived magma. It is inferred that the granitoid was formed against the setting of continental-continental collision.