Abstract: The paper aims to study the growth characteristics and yield performance of super rice mechanization planting under different fertilizer levels and different plant density in South China doublecropping rice, and clarify super rice mechanization planting suitable fertilization level and planting density. The experiment of 4 fertilization levels (0, 120, 150, 180 kg/hm²) and 2 mechanized planting density (2.4×105 hills/hm², 2.85×105 hills/hm²) were investigated with Hemeizhan, a traditional super rice, as the materials at early and late season in 2012. The results showed that: (1) At the same level of fertilization, with transplanting density of 2.85×105 hills/hm² , the increase of dry matter accumulation, leaf area index(LAI), effective panicle, yield were higher than that with transplanting density of 2.4×105 hills/hm² and the difference were remarkable. (2)At the same transplanting density, the increasing trend of dry matter accumulation, leaf area index (LAI), effective panicle and yield with fertilizer level increasing were declined in low-middle fertilization level (120-150 kg/hm²), high fertilization level (180 kg/hm²). The treatment of nitrogen fertilizer 120 kg/hm² obtained the highest agronomic use efficiency (AE) in this experiment. Chlorophyll content (SPAD value) had no obvious regularity. Transplanting density of 2.85×105 hills/hm² and fertilizer application of 120-150 kg/hm² were the suitable cultivation program to get high yield in Guangdong double- cropping mechanization painting rice, appropriate transplanting density and rational fertilization level were effective ways to increase production.