Effects of different organic materials on rice seedling growth and nutrients accumulation were studied through rice seedling pot experiment.Results showed that:(1) The COC was the optimal substrate,which was mixed in different proportions by ground corn stalks,organic manure,peat,zeolite,vermiculite,fine river sand,carbon powder,etc.The quality of rice seedlings cultured on it was the best;(2) Effects of different materials on the growth of rice seedling were that ground corn stalk was better than rice shell powder and mushroom residue effect was poorer;(3)For the rice seeding growth,treatment of carbon powder added were better than all the other ones among the treatments of the same ratio.Results of this study would provide a theoretical basis for selecting material of the substrate production of rice seedling.