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Through field geological investigation��it is determined that the unconformity contact between Tuan- shanzi and Dahongyu formations of Changcheng Group in Xingcheng��Liaoning Province�� In Jiashan��the top of stromatolite dolostone in the 3rd Member of Tuanshanzi Formation develops the ancient karst landform while there are basal conglomerates in the bottom of Dahongyu Formation�� On the contact surface��we can see the conglomer- ates of Dahongyu Formation are filling in the dolomite of Tuanshanzi Formation along the Karst cave��cleavage crack or structural fractures�� The geochemical analysis results show that the sedimentation environment of Tuanshanzi For- mation is oxidizing and the paleo climate is warm and wet�� But the sedimentary environment of Dahongyu Forma- tion is lean oxygen to oxidation��the paleo climate is hot and dry�� The results above can prove that it is reasonable for the existence of Xingcheng movement which has a great influence on Xingcheng area��