Abstract: Experiments were conducted to study plant growth and grain yield formation with Jinyou 253 and Zhongyou 315 as experimental materials under two soil tillage patterns and three planting densities in the system of rice intensification. Results showed that tillage patterns and planting densities made obvious influence on plant growth and grain yield. Under different planting densities with the same tillage pattern, tillers per plant increased with increase of planting space while tillers per unit area decreased with increase of planting space; The maximum leaf area at heading as well as its withering decreased with increase of planting space; Dry matter accumulation before heading decreased with increase of planting space, but the accumulation after heading was the most under the density of 35cm×35cm, and the total accumulation at ripening decreased with increase of planting space, Apparent transportation rate of dry matter in stem and leaf decreased with increase of planting space; Effective panicles decreased with increase of planting space while spikes per panicle, seed set rate and 1000-grain weight increased with increase of planting space. Grain yield decreased with increase of planting space under no-tillage pattern, however, it was the highest under the density of 35cm×35cm and conventional tillage pattern.