To identify distribution and development of coast erosion in Liaodong bay, erosion situations of typical coastal zone are studied on the basis of field investigation data. The results show that according to erosion landform features, coast erosion in Liaodong bay can be divided into five patterns: washing and abrasion type, wave collapse type, block avalanche type, karst depression type, interface slip type; according to degree of corrosion and siltation, coast erosion in Liaodong bay can be divided into five grades: serious erosion, intensive erosion, erosion, micro-erosion, stability. Sandy coast is eroded mainly in wave collapse type, rocky coast is eroded mainly in block avalanche type and karst depression type, and silty mud coast is eroded mainly in washing and abrasion type. Investigation on disease pattern and grade distribution of coast erosion is helpful to prevention of coastal zone in Liaodong bay.