Abstract: Using the provincial panel data from 2011~2021, we measured the level of coordinated development of the agricultural industry chain through the composite system coordination model. We further analyzed the evolution trend, future development and agglomeration mode of the coordinated development of the grain industry chain through Kernel estimation and spatial autocorrelation. The conclusions were as follows:（1）During the research period, the level of collaborative development of the grain industry chain showed a significant growth trend. Among them, the level of collaborative development of the grain industry chain in Hebei Province ranked among the top in all provinces; （2）There were differences in the level of collaboration between regions in the grain industry chain, and the phenomenon of two-stage differentiation was more obvious. The difference in the collaborative development of the industry chain within the region was relatively small, and there was a certain degree of regional collaborative evolution trend. While maintaining their own stability, different regions also had a trend towards higher value collaborative areas; （3）The collaborative development of the grain industry chain between provinces was closely related and there existed a clear spatial correlation. The spatial distribution of the collaborative development level of the grain industry chain showed a majority of H-H and L-L distribution characteristics, and a positive aggregation;（4）Overall, economy, capital, and innovation had a positive and significant impact on the synergy level of the agricultural industry chain, but the contribution of individual factor varied in the three major regions. These conclusions provided realistic references for guaranteeing the implementation of the concept of the Big Food Perspective and promoting agricultural development.