Abstract: Online sipping is an effective measure to screen a damaged fuel assembly in PWR,and it is an important part of the fuel assembly integrity management.This paper introduces the problems existing in online sipping calibration and data analysis method,analyzes the causes of the problems,and proposes improved methods.Practice shows that these improved methods reinforce the reliability of online sipping detection and judgment,solve the online sipping calibration problem of poor reliability,and solve the online sipping data analysis problem of low efficiency.