Abstract: Based on a survey of Mesozoic sedimentary basin in Heishui Town， Jianping County， Chaoyang City， Liaoning Province， the intrusive and volcanic rocks with good peripheral exposure and fresh at the basin edge were sampled systematically， whose chronology was tested through zircon with (LA-ICP-MS) U-Pb isotopic method. It was concluded that the basin was based on the intrusive rocks which formed during the early Triassic to the late Jurassic， and the basin basement is composed of the volcanic rocks of Yixian Formation. Based on the sporopollen testing and sedimentary characteristics， it was found that the basin is composed of lower Jiufotang Formation， Fuxin Formation in lower Cretaceous and Sunjiawan Formation in upper Cretaceous. By combining the borehole data， an evolution model of the basin could be established. The faults at the northern edge of the basin are contemporaneous structure， and the base is a graben basin in the shape of dustpan.

Key words: Liaoning Province, contemporaneous structure, model, Yixian Formation, basement