The acute toxicity from three types of industrial wastes in photobacteria test significantly decreased, even disappeared, after land treatment. The genetic toxicity of samples both in the Ames test and in the spontaneous dark variant of photobacteria test was weakened from positive to negative, or the degree of positive was obviously weakened. The basic reason why both the acute toxicity and the genetic toxicity were lowered could be attributed to the degradation of the toxic organic chemicals in land treatment substances. The contents of extractable organic chemicats from three types of industrial wastes fell clearly after land treatment. The total degradation rate of organic substances was 40-70%.The degradation rate of primary organic chemicals was 50-90%.It was indicated that land treatment of industrial wastes could get a satisfactory effect, and land treatment would be a prospective good way to the industrial wastes treatment.