Abstract: The HIRLAM system was used in China to test its ability in forecasting the summer torrential rain in Yangtze River valley. The experiments of three selected torrential rain cases show 0 ~ 24 h accumulated rainfall forecasts are quite successful, being able to reproduce most of the observed torrential rain areas (daily rainfall≥50 mm) in the Yangtze River valley. The 24 ~ 48 h accumulated rainfall forecasts vary with different cases. Some cases are successful, some are failure. On the whole 24 ~ 48 h rainfall forecasts are worse than 0 ~ 24 h forecasts, especially for the forecast of daily rainfall≥50 mm.