Abstract: The aim of our experiment is to clarify the correlation of the accumulative moths caught and the rate of fruit injury in harvesting time, and the threshold of Carposina niponensis Walsingham control, thus to provide evidence for Carposina niponensis Walsingham prevention. In the non-experiment site of jujube yard, we randomly placed 3 self-made Carposina niponensis traps and recorded the captured adult amount to analyze the occurrence dynamics of Carposina niponensis Walsingham. According to the captured adult amount, when the accumulative amount moths caught changed greatly in different phenological periods, we covered the fruit with about 500 fine gauzes and investigated the rate of fruit injury during the picking time. When we detected a big fluctuation of accumulative moths caught, we delayed the spray of 1% emamectin benzoate-chlorfenapyr EC and 40% phoxim EC for 3-4 days. After spraying, we covered the fruit with about 500 fine gauzes and investigated the rate of fruit injury. Then we analyzed the results with SPSS 17.0 data processing system, and compared the correlation of the accumulative moths caught and the rate of fruit injury by using Excel 2007. Carposina niponensis Walsingham in Cangzhou Jujube Orchard had one generation a year, born in late June, peaked in late July, and ended in the middle of September. The accumulative moths caught had a positive correlation with the rate of fruit injury (P＜0.05). In the natural growing jujube orchard, the comprehensive data for two years was Y= -0.000001X² 0.008X 3.342(r²= 0.874, P＜0.05); in the chemical control condition, the comprehensive data for two years was Y=-0.000002X² 0.006X 0.179(r2=0.890, P＜0.05). After stable fruit setting, if we carry out spraying when the number of the accumulative moths caught is no more than 15, the rate of fruit injury will be less than 2% .