Stream pothole, is a common microrelief type of river bedrock in mountainous area, recording key information of the evolution of regional geomorphy and the interaction between running water and riverbed boundary. In this paper, the morphological characteristics of 110 stream potholes in Longtanzi River， Cangwang Gorge， Wangcang， northern Sichuan, are measured and analyzed statistically. The results show that the size, depth and morphology of common potholes are irregular in the riverbed profile, while bead- like potholes are regular to some extent. The potholes distribute intensively in siliceous conglomerate of the Lower Cambrian Yanwangbian Formation, among which the quartz sandstone interlayers are very important to the formation and evolution of potholes, and potholes in the double- layer natural bridge are the typical representative. NE and E—W planar X- conjugate structural joints and S—N structural joints were developed in the region. Triangular, rhombic and irregular potholes were mostly controlled by two or three sets of joints, among which the S—N structural joints also controlled the long axis direction of the potholes and valley direction. The structural joints have played an important role in the evolution of the mouth morphology of potholes, but have no obvious effect on the vertical morphology of potholes. This study will enrich and improve the research data of stream potholes, provide a scientific basis for the evolution of river geomorphology and tectonics in Micangshan area.