Changes of gas exchange and chlorophyll fluorescence parameters in the leaf were determined to study the effects of high temperature and strong light on photosynthesis of Myrica rubra plants. Two-year-old ‘Dongkui’ and ‘Tanmei’ containerized bayberry seedlings were selected as plant materials. The net photosynthetic rate (Pn) was assayed at saturation intensity (800 μmol·m^-2·s^-1) with different temperature treatments and leaf gas exchange and chlorophyll fluorescence parameters were also tested under different temperature and light intensity conditions. Under the condition of 40℃+1500 μmol·m^-2·s^-1 VS 25℃+500 μmol·m^-2·s^-1，Pn of ‘Dongkui’ and ‘Tanmei’ decreased by 69.1% and 102.6%, respectively and apparent quantum yield (AQY) and maximal photochemistry efficiency (Fv/Fm) obviously increased, while the initial fluorescence (Fo) increased by 23.3% and 30.4%, respectively. At the light intensity of 500, 1000 and 1500 μmol·m^-2·s^-1, stomatal conductance (Gs) showed decreasing trends, while transpiration rate (Tr) linearly increased with a temperature elevation. In conclusion, strong light unremarkably induced bayberry leaves photoinhibition at 25℃, but high temperature and strong light intensified the degree of photoinhibition. In addition, the degree of photoinhibition of ‘Dongkui’ was less than ‘Tanmei’, wihch indicated that ‘Dongkui’ was more resistant to high temperature and strong light stress.