Abstract: In order establish forecast model for returning green stage of Leymus chinensis in Ewenke Autonomous County,the relative soil moisture of soil layer in depth of 20-30cm of April 18th and 28th of the recent 30 years,returning green date and returning green days of Leymus chinensis in recent 22 years and the temperature of each month in recent 22 years were statistically analyzed.The results showed that the relative soil moisture of soil layer in depth of 20-30 cm and the returning green days of Leymus chinensis was not the main factor that influencing returning green stage Ctemperature was the main factor that influencing returning green stage.Based on the correlation between returning green date of Leymus chinensis and average temperature of Match to May and Match to April,the forecast model for returning green stage of Leymus chinensis in Ewenke Autonomous County was established as Y=-2.34×T3-5＋123.38,Y=-1.79×T3-4＋113.41. The established model would provide theoretical basis for the timely and accurate forecast of returning green stage of natural pasture forage.