Abstract: Using the irrigation soil moisture plant agricultural microclimate theoretical system to study the flow phenomena under the irrigation of water delivered on the plastic film covered wheat-cotton intercropping field, the characteristic of soil moisture circulation and the relationship between growth habit under wheat-cotton symbiotic conditions and agricultural microclimate. The results show there are water saving about 29 % and 47 % respectively for symbiotic conditions and cotton growth only, intercropping in yield of 3.8% and 11.8% respectively for wheat and cotton.