Abstract: 【Objective】 To study the dynamic difference of Xinjiang's main spring wheat varieties at the grain filling stage in four different ecological regions. 【Method】 Eight varieties of Xinjiang spring wheat with different gluten strength in the four ecological regions were selected as study object, and a logistic equation was adopted for fitting to calculate a series of grain filling characteristic parameters and analyze the dynamic difference of Xinjiang's main spring wheat varieties during grain filling under different ecological conditions based on the dynamic changes in the dry matter of the wheat grain at the grain filling stage. 【Result】 The maximum theoretical grain dry matter weight in eight wheat varieties tested (K value) was mostly (2.861±0.365) g/wheatear, and the ratio of final grain dry matter weight to K value decreased by 13.37%-25.26%.The tested variety Xinchun No.40 was the first to enter the early stage of the rapid grain filling process 13.24 d after the initial flowering stage, Xinchun No.46 was the latest to enter the early stage of the rapid grain filling process 15.17 d after the initial flowering stage, and Xinchun No.11 (14.66 ± 0.4)d was the most stable at the early stage of the rapid grain filling process in the four ecological regions.Xinchun No.6 was the fastest to reach the final stage of the rapid grain filling process 25.25 d after the initial flowering stage, Xinchun No.26 was the latest to reach the final stage of the grain filling process 29.07 d after the initial flowering stage, and Xinchun No.38 (26.86 ± 0.48) d was the most stable at the final stage of the grain filling process in the four ecological regions.For average performance of the continuous rapid grain filling stage, Xinchun No.6 had the shortest continuous rapid grain filling stage of 11.10 d, Xinchun No.26 had the longest continuous rapid grain filling stage of 14.08 d, and Xinchun No.40 (12.97 ± 0.45)d was the most stable at the continuous rapid grain filling stage.The maximum relative grain filling rate of Xinchun No.6 is the highest with 0.17 g/wheatear per day 19.51 d after the initial flowering stage, while that of Xinchun No.11 is the lowest with 0.12 g/wheatear per day 18.27 d after the initial flowering stage.The average performance of the early and final stages of the rapid grain filling process in the four ecological regions (the number of days after the initial flowering stage) is: Junhu < Yanqi < Emin < Altay Prefecture.The average performance of the continuous rapid grain filling stage in the four ecological regions (the number of days) is: Altay Prefecture < Emin < Yanqi < Junhu.The average performance of the maximum grain filling rate (V_m): Yanqi (0.11 g/(wheatear·d)) < Junhu (0.13 g/(wheatear·d)) < Emin (0.15 g/(wheatear·d)) < Altay Prefecture (0.17 g/(wheatear·d)). 【Conclusion】 For the tested main wheat varieties, the average grain number per spike is low and the variation range of the overall performance is large, indicating that the grain number per spike of spring wheat varieties in Xinjiang can be improved to increase production.The performance and stability in different grain filling characteristic parameters are different in different regions due to variety characteristics.The effect of different grain filling characteristic parameters shows that the early stage of the rapid grain filling process and the maximum grain filling rate are affected mostly by regions, the end stage of rapid grain filling process is affected mostly by regions×varieties.In the four different ecological regions, the grain filling characteristic parameters in the early stage and the end stage of the rapid grain filling process are consistent, and the other grain filling characteristic parameters are different.