Abstract: Water vapor transport is decomposed into mean transport and eddy transport. Analysis of water vapor over South China during the first rainy season of 1994 shows that difference between season mean transport and season total transport is less than 10%. For month and for ten-day average the difference is more than that. The transient transport of water vapor is the least among all kinds of eddy transport. Its amount is only ±2% of total transport for column. The constant wave transport is the largest. Sometime it may be 5-6 times of total transport.