A soil culture experiment was conducted to study the effects of 1,2,4-trichlorobenzene (TCB) on morphological and physiological indexes of rice at maximum tillering stage, using rice cultivars of Ningjing 1 (TCB sensitive genotype) and Yangfujing 8 (TCB tolerant genotype), with four treatments of TCB concentrations including 0 (CK), 20, 40, and 60 mg kg -1 . The results indicated that the maximum root length, plant height, tillers per hill, shoot and root dry weight of Ningjing 1 were all decreased significantly (P<0.05) under different concentrations of TCB. Low TCB stress (20 mg kg -1 ) significantly increased Yangfujing 8's maximum root length, shoot and root dry weight, root activity (P<0.01), while medium and high TCB stresses (40 and 60 mg kg -1

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