Abstract:We studied the growth,photosynthetic parameters,biomass and physiological characteristics of oneyearold Daemonorops jenkinsiana seedlings under shading, drought, and shadingdrought intercross stress in order to clarify the effect of shading and drought stresses on the growth and physiobiochemical characteristics of D. jenkinsiana. (1) As the increasing of shading rate, the plant height, ground diameter and numbers of functional leaves also increased, and the biomass, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), water use efficiency (WUE) increased initially, and subsequently decreased. (2) The physiological changes were also measured. The proline and soluble protein contents increased initially, and subsequently decreased as the increasing of shading rate. However, MDA content initially decreased and increased subsequently. Similar changing trend were found in the activities of SOD and POD. (3) The plant height, ground diameter, functional leaf number and biomass, Pn, Tr, WUE, Pro and SP contents increased significantly (P<0.05) and the MDA content and SOD activity decreased significantly (P<0.05) under the shading rate of 20%-30%. (4) The increasing degree of drought stress resulted in the obvious reduce of plant height, ground diameter, leaf number and biomass, Pn, Tr, WUE (P<0.05). On the contrary, the SOD and POD activities enhanced and the MDA and Pro contents increased. It was suggested that both shading and drought had influenced the growth of D. jenkinsiana. However, D. jenkinsiana could adapted certain degree of drought and light intensity by altering the photosynthesis and metabolism, even altering plant phenotype. Moderate shading could improve the growth of D. jenkinsiana, and remitted the disadvantage caused by drought conditions.