In order to explore the application of entropy weight-TOPSIS method in plant drought resistance evaluation, taking potted water control as experimental method and seedlings of 7 common afforestation tree species in lithoid hilly area of North China such as F.chinensis were used as experimental materials, then measured their net photosynthetic rate (Pn), chlorophyll content, stomatal conductance(gs), water use efficiency (WUE), malondialdehyde (MDA) content, cell membrane permeability, superoxide dismutase (SOD) activity, proline content and relative water content of the leaves. The responses of these indicators to drought stress were analyzed, and the photosynthesis and osmotic adjustment effects of different plants under drought stress were evaluated. The results showed that, under drought stress, the Ci of photosynthetic effect and osmotic regulation effect of G.sinensis were higher than those of other tree species, which were 0.669 and 0.528, this indicates that the G.sinensis has the strongest drought resistance. Based on entropy weight-TOPSIS principle, the drought resistance of 7 tree species was evaluated by comprehensive evaluation: G.sinensis>M.azedarach>Q.acutissima>R.pseudoacacia>C.coggygria>F.chinensis>K.paniculata. The results of drought resistance evaluation of tree species based on entropy weight-TOPSIS method were consistent with the actual growth of plants and previous studies. So the comprehensive evaluation of the drought resistance of the plant is feasible by using the method.