The force and structural stability of new type deflector-porous fence and traditional flat-porous fence with square or circular hole and porosity of 30% for all the three kinds of fences were studied using CFD software Fluent 6.2. The results showed that there was no obvious increase about wind load between deflector-porous fence and tradition ones

and the wind-load increased with increasing wind speed

showing a quadratic growth. The wind-load growth about 20 times when wind speed increased from 3 m·s-1 to 15 m·s-1. There was no obvious difference of the ratio of force arm and fixed fence high among different fences and little change with increasing wind velocity. The main reason of the formation of porous fence resistance was the different pressure before and after fence and the development of trailing vortex turbulence.