The forecast of cropevapotranspiration (ET) is one of the essential parts of the work for compiling e dynamic plan of imigation water use. It plays an important role in saving water, ineressing ropyields and economic benefits in en imigation area. In this paper, amocile for a shortrange glass than 15 days forocasl of ET is introduced and ciscussoid The ralationship between ET ard the melecrological factors and ono-motoorological tactors such as tho factors of plant and scil are enalysed. The models which express the effects of meteorology. Plant and soil on ET separately are recommended, Based on these moreis a combined model for the forecast of ET and the eonerete methods of the short-range forecast of ET are presented.