The Haoyihada intrusive body，which occurred in the continental margin accretion belt along the north margin of North China Plate in the middle region of Inner Mongolia，is composed the pyroxene diorite. With isotopic dating and geochemical research，the zircon LAICPMS UPb dating of two samples yields an age of 266±2 Ma，failing into the range of late Permian Epoch. The geochemical characteristics of 14 samples are as follows，the pyroxene diorite shows lowSiO2(4787～5617 wt％)，highMg(365～679 wt％)，also higher largeion lithophile element of Rb，Sr and LREE，low highfield strength elements of Nb，Ta，highCu(3597×10-6～11224×10-6)，REE patterns have negative Eu anomalies. It is suggested that the Haoyihada intrusive body should be among the calcalkaline series，has the tectonic background of islandarc and its materials mainly derived from upper mantle and had fractional crystallization. The geochemical characteristics and the strong mineralization of Cu and W of Haoyihada intrusive body prefigured that the potential of ore prospecting and exploration is great in this area.