Abstract: A coupling micrometeorological model for SPAC system over maize field in Huang Huai Hai Plain is presented. The model consists of turbulent flow equation system and canopy radiation assumption regarding energy balance for a leaf. The canopy is divided into several layers, aiming at revealing the vertical profiles of mean quantities within it and providing scientific basis for parameterization of terrestrial processes. The model is shown capable of well simulating the microenvironment of maize canopy in go...