The effects of heat and moisture transfer process are calculated on some typical points having different positions from the inlet in air-water or -hydroscopic solution system. Based on the effects and the direction of mass and total heat transfer as well as the correlations between them

the mass and total heat transfer process can be divided into four zones for air-hydroscopic solution（zone A—zone D）

and three zones for air-water（zone A—zone C） for air-water. The transfer characteristics for heat and moisture in different zones are analyzed

the flow pattern of better effect of mass transfer is obtained and the boundary lines between the zones are determined. The process for air humidification and solution regeneration are optimized with the help of reachable handling region as well as the results of heat and moisture transfer

indicating that heat should be put into water or solution rather than air to get better air humidification and regeneration.