In the experiment of rice seedling-raising in the plastic greenhouse, materials were selected and ratio of inorganic nutrients defined to find the best formula of the growing media without soil. The results showed that the best material ratio was 50% rice husk + 10% cow dung + 20% brown coal powder + 20% bentonite. The best ratio of inorganic nutrients is N:P₂ O₅:K₂ O=6:2:2. The best formula is mixed the materials with 3% nutrients. The root system of rice seedling is well developed. Seedlings have large quantity of white root and strong resistance. High quality seedling was raised easily without weeding using this media.