Abstract: In order to determine the isolation protective effect of genetically modified (gm) rice genetic drift, the field trials of the isolation protective measures had been designed. According to the experimental data and the characteristics of the windspeed distribution in protective isolation area, the speed distribution pattern of windward and leeward in protection zone had been established and the applicability of the model had been tested by the measured data. The results showed that: correlation coefficients of leeward side in each model were above 0.95. But because of different observation height and direction angle, there was a certain difference in model coefficient. The average relative error between simulated values and measured values in windward side mode was less than 10%. However, the model built in this research had limitations, and the scope of application was very limited.