Abstract: As shown in a statistical analysis of the relationship between environmental fields at varied times and tropical cyclone motion,the forecasting ability of initial environmental field predictors for tropical cyclone motion decreases with valid time and that of future environmental field predictors is better than one of initial environmental field predictors;the time at which forecasting ability of predictors is better mostly does not appear over the same valid time forecast,For valid time of forecast at 48-120 hours the time at which forecasting ability of predictors is better appears mostly at 48-72 hours from initial time.The forecasting errors of statistical interpretation models for forecasting tropical cyclone motion by using NWP data are less than one of statistical models by using initial environment field predictors.These results are to become foundation of constructing models for objective forecasting tropical cyclone motion.