The simulated experiments were conducted to study effects of chloromethane included DCM,CF and CT on wheat seedling chlorophyll and soil respiration.The results showed that,the wheat chlorophyll were inhibited,and the inhibition was varied when the concentration of chloromethane was different.The more concentration was,the lower content of wheat chlorophyll was.The median inhibitory concentrations of DCM,CF and CT were 399.3 mg/kg,42.82 mg/kg,9.14 mg/kg,which indicated the toxicity of CT > CF > DCM.That was to say,the more H atoms were replaced,the more toxin would be.All the three chloromethane inhibited the soil respiration,and the inhibitions were stronger when the chloromethane concentrations increased.The inhibitory effects to soil respiration were temporary and would renew as the time last.