Abstract: This study was conducted at Hengshui Dengzhuang China-Canada Experimental Station. The kernel filling process of winter wheat was observed and analyzed. The results showed: The kernel filling process of winter wheat could be described with Logistic equations. The field management had large effects on the kernel filling process and harvest grain weight. The grain weight mainly depended on length and strength of kernel filling period. The beginning and peak of kernel filling could be delayed with better soil moisture condition and higher nitrogen application. The highest filling rate decreased as plant population increased.