I have made an experiment with irrigating and without irrigating. Afterwards, I compare the rusults. I find that soil moiture, total cloud fraction, precipitation, downward longwave radiation, latent heat flux, etc, are increased at irrigated area. And surface temperature, air temperature, sensible heat flux, etc. are reduced. The surface runoff should be increased at irrigated area, but the modeling rusults shows the surface runoff is reduced. I don't find any wrongs with the model and handling ways . I couldn't explain the reasons why the surface runoff is reduced at irrigated area. So I would like to ask for help of friends.