Abstract: It is of great significance to cultivate good and strong rice seedlings using different proportions of media. The authors used four raw materials, vermiculite, perlite, peat and wormcast, and mixed them together according to different proportions for breeding rice seedling. First of all, the different physical and chemical properties of the growing media were analyzed, then their effects on rice seedling growth were compared, finally the best ratio was determined. The results showed that the mixed growing media of domestic peat: sand =2:1 and wormcast: domestic peat: sand =2:1:1 were suitable for the growth of rice seedling. Comprehensive comparison found that weak acid environment was favorable to rice growth, and the rice seedlings grew well in domestic peat. Wormcast could effectively increase the nutrient content, but too much of it would increase the pH value of the growing medium, which was adverse to rice growth. The control of the wormcast amount could replace part of peat to meet the requirement of rice growth.