Through absolute liquid reference method,the bend static liquid surface dynamics equation is built for calibrating the system error of interferometer,and theoretical simulation and experimental measurement are carried out for wetting effect on liquid surface.The stability of liquid surface effected by the environment factors such as air current,temperature,vibration,is analyzed,the experiment is taken,and estimate indexes are given.The absolute liquid reference with high-accuracy is set for calibrating interferometer system error under laboratory environment,the results are given,and the measurement accuracy is ensured.