RESUMEN
This article is aimed to study the response mechanism of Acanthopanax giraldii on different shading intensity to guide its artificial cultivation. The cultivated A. giraldii in Maoxian was used as the research object, set up different shading treatment groups, analyzed photosynthesis, physiology, submicroscopic structure to explore the response mechanism of A. giraldii to different light intensity. Light was the main influencing factor to photosynthetic rate.During morning and afternoon periods,the Pn of the CK group reduced by stomatal limitation and non stomatal limitation factors respectively. While during 14：30-18：30 period, the Pn of A₁ and A₂ groups reduced by non stomatal limitation factors.LSP, LCP and Rd of A₁ and A₂ groups were significantly lower than those of CK group;The content of SS and SP of A₁ and A₂ groups were lower than those of CK group. The content of Pro of CK group were significantly higher than those of group A₂.The activities of SOD and POD of them was higher than that of CK group,CAT activity of A₁ and POD activity of A₂ were relatively higher In their respective free radical scavenging system. Starch grain increased and base grana declined in the chloropalst of those group CK. The study results indicated that response mechanism of different shading conditions of A. giraldii under field cultivation conditions. Its could effectively adapt to environmental changes of the home cultivation,which provided a reference for ensuring yield and quality.