The simulating test was conducted to analysis how waste fiber felt mulches with different surface density affected moisture evaporation from soil surface.The test was using waste fiber felts with the density of 100,200,300,400 and 500 g/m²,compared with bare surface as contrast.The result indicated that the waste fiber felt mulches would inhibit soil moisture evaporation efficiently.Inhibitory effect of the evaporation was related with the surface density obviously.The more surface density resulted to a better inhibitory.The inhibitory effect would keep to a stable level when surface density of waste fiber felt mulches reached a certain value(400 g/m²).