Field experiment was carried out to find better amount of N (nitrogen) fertilizer and planting density of Wufengyou T025 in red paddy soil. The tillering dynamics and yield were analyzed under different N ratio and density compared with Tianyou 998. The results showed that the tillering dynamics of Wufengyou T025 was similar to Tianyou 998. The effective tillers of Wufengyou T025 were 328/m2 in 60 days after transplanting, and Tianyou 998 were 349/m2. There was no significant difference among different N rate. However, the tillers per square meter of Wufengyou T025 in D32 and D26 treatment were increased by 13.8%~33.1% and 6.4%~11.1% compared with D21. The tillers per square meter of Tianyou 998 were increased by 30.1%~34.9% and 5.7%~12.1%. The grain yield of N180D32 was highest in all treatments, where Wufengyou T025 and Tianyou 998 were 10 719.0 and 9 682.7 kg/hm2, respectively. The effective panicles and grain numbers per panicle of Wufengyou T025 were higher than Tianyou 998, and the effective panicles were significantly positively correlated with the yield. Therefore, reasonable increase in planting density was mainly increased the effective panicles and achieved high yield. The better ratios of N fertilizer and density were N 180 kg/hm2 and 320 000 hill/hm2.