Comparison is made among three climatological calculation techniques for watertransfer in the atmosphere。They include the instantaneous,averaging and layer-to-layer mean methods.Results show that all these methods are able to display roughly the same direction for water transfer but with remarkable difference in the amount,Comparison indicatesthat the instantaneous method is most accurate and layer-to-layer mean method next to it butwith rather a big interannual fluctuiation in errors.And the averaging technique,though simple,is prone to produce large errors。