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We studied gas-exchange, chlorophyll pigments, lipid peroxidation, antioxidant enzymes, and biomass partitioning responses in seedlings of four wolfberry species (Lycium chinenseMill. var. potaninii(Pojark.) A. M. Lu, Lycium chinenseMill., Lycium barbarumL., and Lycium yunnanenseKuang & A. M. Lu) under four water supply regimes. In all four species, drought affected seedlings in terms of chlorophyll content, net photosynthesis rate (Pn), transpiration rate (E), and lipid peroxidation. Drought also increased some antioxidant enzyme activities, such as peroxidase (POD), catalase (CAT), superoxide dismutase (SOD), and ascorbate peroxidase (APX). Significant changes in dry biomass partitioning also occurred in response to water stress. In particular, dry biomass of leaves and fruits decreased significantly. L. chinenseMill. and L. barbarumL. possessed greater drought tolerance and exhibited superior antioxidant processing ability and other related physiological traits compared to the other two species. L. chinenseMill. was the most tolerant to all levels of drought. In contrast, L. yunnanenseKuang & A. M. Lu was more affected by water supply and had the lowest resistance to drought stress. These findings would provide some important information regarding genetic resources for future forest tree improvement in relation to drought tolerance.