Abstract: Rice plants of Nipponbare and L81 were grown in cement pool filled with paddy soil, and artificial lodging was induced at 20 days after heading or 10 days after heading. [Objective] The impacts of artificial lodging at different grain filling stages on rice growth, grain yield, yield components, and dry matter production and distribution were investigated. [Result] The artificial lodging treatments of 20 days after heading and 10 days after heading decreased the grain yield of Nipponbare by 8% (p>0.1) and 20% (p<0.01), and that of L81 by 21% (p<0.01) and 29% (p<0.01), respectively. The number of panicle per unit area and spikelet number per panicle were not influenced by artificial lodging, but rice grain filling capacity was greatly reduced. The treatments of 20 days after heading and 10 days after heading significantly decreased the full-filled grain percentage of Nipponbare by 8% and 16%, and that of L81 by 16% and 21%, respectively. Sim-ilar but less treatment effects were detected on full-filled grain weight and the average weight of all grains. Sig-nificant variety by treatment interactions (20 days after heading or 10 days after heading) were detected on full-filled grain percentage. Two treatments of artificial lodging significantly reduced total dry weight and the dry weight of each aerial organ, and the biggest reduction was 31% (p<0.01). On the contrary, the effects of artificial lodging on the dry matter distribution of two cultivars, in particular L81, depended on the treatment time: the treatment of L10 reduced the proportion of biomass distributed in the reproductive organs, but the treatments of 20 days after heading showed the opposite trend. [Conclusion] The experimental results show that the impacts of lodging during grain filling stage on rice grain yield varied with rice varieties and the time of lodging. The yield loss caused by lodging mainly associated with the decrease in grain filling capacity, especially the full-filled grain percentage, the latter may be related to the decrease in leaf photosynthetic capacity during grain filling stage.