Abstract: With a 11-layer primitive equation model, Fritsch et al's (1980) cumulus parameterization scheme and Kuo's scheme (1974) are compared in simulating a Meiyu precipitation process on 27 June 1981.It's indicated that the two scheme have different convective feedback. For the Fritsch et al's scheme, the convective heating rate is negative at cloud base and top. Difference is also found in the convective moistening rate, leading to contrasting features for their resultant fields of precipitation, temperature and pressure. The vertical exchange of momentum is considered in Fritsch et al's scheme, which is analysed here with the conclusion that the exchange tends to unifonhize the environmental wind fields and may be a factor for cumulus decay.