A yield loss simulation model for rice pests was developed (Willocquet et al 1998, 2000) as a tool for setting research priorities and improving pest management. This model is production situation (PS)-specific and addresses yield loss caused by several rice pests. The model has been tested in several PSs in the Philippines, Vietnam, and northern India, using field experiments done at different sites. In most cases, the model adequately simulated the attainable growth of a rice crop, as well as losses from various pests (diseases, insects, and weeds) (Willocquet et al 1998, 1999a,b, 2000). The work reported here was aimed at further testing this model under PSs and injuries prevailing in the Chinese rice-wheat system. The PSs and injuries addressed here were defined based on the characterization of rice injury profiles and PSs recently done across tropical Asia (Savary et al 2000). The first PS, PS2, is a reference used in all field-test experiments. Two other PSs (PS6 and PS7) represent PSs prevailing in Zhejiang Province. Whiteheads caused by stem borers, sheath blight, and weeds are considered as common rice pests in the province.