Abstract: This paper reported mainly the research results of masson pine′s high-quality-container seedling cultivation of 3 years using root-unfolding-container and half-light-medium. (1) Seedling cultivation using root-unfolding-container could make root system extend along guiding trough instead of folding, promote side or thin root development by natural air-root-cutting,and increase plantation survival rate by tight combination of root system with medium and formation of solid root unit. (2) In comparison of two types of root-unfolding-container,box-type container was better than pipe type contaner,with 12.8% and 24.6% of seedling height growth and biomass,less stem/root rate,stronger root system, and higher seedling quality. (3) In medium comparison test,by comprehensive index selection of seedling growth, root quantity,physical and chemical charactertics,and ability of water keeping and nutrient-supplying. The superior half-light medium was mixed by 20%～40% bark-powder,20%～40% sawdust,10%～20% pig-manure,30%～40% nutrient soil and 2%～3% phosphorus fertilizer.