In order to solve dynamic problems caused by the internal structure of fluvial reservoir，it is necessa- ry to study the fine anatomy of point bar． Taking Minghuazhen Formation in the northern block of Q oilfield， Bohai Sea as an example，the authors studied identification marks，distribution pattern and scale of point bar based on coring， logging and dynamic data． The results show that the length of point bar and the width of lateral accretion body are 713- 911 m and 71- 111m，respectively; the dip angle and the thickness of lateral accretion bedding are 3.5°- 5.9° and 0.1- 0.5 m． The lateral accretion beddings are the key factor affecting the seepage velocity of the tracer．