In this paper,a group of dynamic models, which can be used to describe quantitatively the extent suitable tovegetative growth and yield formation of corn crop,are set up by applying the viewpoint of syste motology and themethod of fuzzy mathematics. And various corn-climate indices are calculated, based on the data for 1951-1980 from 24 meteorological observing stations in Hebei,China and Missouri, America. It is shown that the corn-climate resource index(I_r),the efficiency index (I_α) and the utilization coefficient (C_α) of Hebei province are a little higher than Missouri’s. Finally, the reliability of the results,and the applicability of the suitability-degree theory and the dynamic models in the assessment of agroclimatic resources are demonstrated by analysing the results and comparing them with the facts.