In order to investigate the effect of decomposing walnut(Juglans regia L.) leaf litter on the growth of crops in walnut and winterness crops intercropping system,we applied a pot experiment.Radish(Raphanus sativus L.) seeds were sowed in the soil mixed with different amount of walnut leaf litter,and the indexes with respect to morphology,physiology and reproduction were determined as the radish growing.The results showed as following:(1)The seedling growth of radish was significantly inhibited by decomposing leaf litter at the primary stage of leaf litter decomposition and recovered its growth afterwards.(2)The stress response of radish induced by walnut leaf litter was obvious,especially at the primary stage of leaf litter decomposition and with high amount of litter addition(120,180 g/pot).It was indicated by decrease of photosynthetic pigments,increase of reactive oxygen and the induced osmotic stress.(3)During the period of measurement,MDA content of radish leaf was not increased obviously,which indicated that the radish can recover from stress by auto-regulation.(4)The plants treated by large amount of leaf litter(120,180 g/pot) produced darker seeds than that of the control and the plants treated by small amount of leaf litter(60 g/pot).The plants treated by 180 g/pot leaf litter produced seeds with lower germination rate than that of other treatments.These indicated the effect of seed quality.On the whole,decomposing walnut leaf litter can induce allelopathic stress on radish especially at the primary stage of its decomposition,but it won’t affect the yield of radish.It is recommended to retain walnut leaf litter and grow crops after a period of decomposition when practice the interplanting of walnut and radish.