The chlorophyll fluorescence effect of higher plants is physiological response to adapt to the environment changes. The impact of any stress on photosynthesis are available through chlorophyll fluorescence changes, which has important significance to measure the effects of stress factors on photosynthetic characteristics of plants. In this paper, single and mixed Reaumuria soongorica and Salsola passerina in 4 different gradient habitats of desert steppe area, semi desert area, typical desert area and extreme desert area as the experimental material, the chlorophyll fluorescence parameters and environmental factors were measured and analyzed to compare the physiological response mechanism of two plants to desert environment gradient under mixed conditions. The results showed that the chlorophyll fluorescence of R. soongorica and S. passerine varied greatly. In the mixed condition, Fv/Fm, Yield and qP value of R. soongorica were higher than that of the single ones, while S. passerina displayed the opposite; with the increase of environmental stress, Fv/Fm, Yield and qP value of R. soongorica and S. passerina in single or mixed condition were decreased, with qN value increased. It indicated that the photosynthetic capacity of R. soongorica was increased when mixed with efficient capture of light energy. However, S. passerina was more selective to the way heat lost light energy.
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