Radiosonde data at significant levels and parametric values of enhanced infrared images over the Changjiang (Yangtze)-Huaihe valley during the Meiyu(Plum Rain) season are fed into an improved time-independent one-and-one-half dimension warm cloud model. Formation and development of only three types of model clouds of different precipitation intensities are numerically analyzed. A simple method of using the output model rainfall to forecast Meiyu frontal precipitation amount is suggested. The results are found to be of significance in the study of the macro-and micro-structures of the precipitus clouds associated with the Meiyu front as well as in the estimation of its rainfall amount.