his paper is the first one to study the environment of radiation energy of deciduousbroad-leaved forest in the warm temperate zone, North China. In this paper,we systematical-ly analysed the course of gross radiation,reflection radiation,net radiation,photosynthetic ac-tive radiation and absorptance radiation and transmittance radiation both above conopy andshrub-herbous layer. The major conclusions are as follows :1. During the growing season, the amounts of gross solar radiation reaching the canopyand sh...