Formal change is made of the correlation coefficient(COCOEF)expression,leading to a new formula consisting ofFourier spectral coefficients that indicates a direct connection between the new form and atmospheric dynamicequations,thus resulting in a dynamic equation represented by COCOEF,which is meaningful in exploring a large-scaledynamic process in terms of the correlation field because the connection revealed by the field can have dynamic explana-tion with the aid of the new formula.