Abstract: The main environmental behaviors of chlorpyrifos，including absorption, mobility, volatilization, degradation in soils, were studied, according to “Experimental Guideline for Environmental Safety Evaluation of Chemical Pesticides”. Results showed that absorption was foud to be better correlate with the tested soils, absorption constant (Kd) of chlorpyrifos in 1oam soil, clay and sand is 213.51, 182.82 and 157.01 respectively. chlorpyrifos does not easily move in 1oam soil and sand, and does not move in clay, is difficult to volatilize on the surface of soils. The half-life of chlorpyrifos degradation in 1oam soil, clay and sand is 23.9d, 12.6d and 9.8d, It is easily degraded in the tested soils.