Abstract: The key development periods of winter wheat was detected by using remote sensing method and growth was monitored based on the detectionThe relationship of EVI time series and green-turning,earring and mature of winter wheat was analyzed,based on agro meteorological data at 271 agrometeorological stations from 2005 to 2010 and remote sensing data of Enhanced Vegetation Index(EVI)and Terra moderate-resolution imaging spectra-radiometer(MODIS).The key development periods of winter wheat were detected by using the maximum slop method,turning point with window method,and simple turning point method.The growth situation of winter wheat during 2006-2010 was monitored by using compassion method EVI during the earring periodThe results indicated that it was feasible to detect key development periods of winter wheat by using the EVI data with a mean absolute errorof 11.2d and an RMSE of 14.61dThe monitoring method based on detecting the earring periods was superior to the traditional method.

Key words: Development period, Winter wheat, Remote sensing, Growth monitoring