Abstract:Crop phenology is a widespread natural phenomenon with annual cycle due to the influence of environmental factors including climate change, surface cover, hydrological status, soil physicochemical properties and field management. It's well known that the phenology not only responds to climate change significantly but also plays an important role in regulating the change of ecosystem structure and functions. For example, the crop phenological changes will directly influence a variety of biophysical and physiological processes of the crops and thus influence the quality and yield of the crops. Therefore, more and more scientists in worldwide focused on the topic of crop phenology. In this study, based on the MODIS EVI multi-temporal remote sensing data, the field samples as well as the high-spatial-resolution Google Earth images, the winter wheat planting area and key phenological stages (green-up date, jointing date, heading date and maturity date) in Shandong Province from 2003 to 2019 were extracted, and the spatial and temporal characteristics of each phenological stage mentioned above were analyzed. The results showed that the green-up date, jointing date, heading date and maturity date of winter wheat in Shandong Province from 2003 to 2019 were concentrated in the 45th-70th day of year, 75th-100th day of year, 103th-125th day of year and 135th-155th day of year, respectively, and showed a spatial pattern of the south earlier than the north, as well as inland earlier than the coastal regions. At the whole regional scale, the decade trend rates of green-up date, jointing date, heading date and maturity date were 1.56 d/10a, 0.65 d/10a, -0.54 d/10a and 2.51 d/10a, respectively, and the change trend of the key phenological stages all presented an insignificant feature. At the pixel scale, the green-up date and jointing date were mainly delayed, and the areas with the significant delay tendency accounted for 1.65% and 3.05% of the total area, which were mainly distributed in the eastern coastal regions and the southern areas of Shandong Province. Nearly 6.56% of the total area showed a significant advance trend of the heading date, which was mainly located in the northeast of Heze. What's more, the area with a significant delay trend of maturity date was accounted for 10.23% of the total area, which was generally found in Binzhou, Dezhou and Jining. It is expected that the results will provide data support and scientific reference for farmland and winter wheat management, as well as agricultural ecological protection in Shandong Province.