The initial fluorescence, maximum fluorescence and chlorophyll relative content of the short-branched and flowering-deficient mutation lines of Loropetalum chinense var. rubrum ‘Jiaolinglong’ were measured to analyze its chlorophyll fluorescence characteristics. The results show that the initial fluorescence value of ‘Jiaolinglong’ was 8921.20, which was higher than that of the control the cultivars ‘Mizhimeihong’ and ‘Huayejimu2’; PS Ⅱ maximum photochemical quantum efficiency of ‘Jiaolinglong’ was 0.763, which showed very significant difference compared to the controls (P<0.01); the relative chlorophyll content of ‘Jiaolinglong’ was 37.88, which was lower than that of the control materials. The short branch and flowering-deficient variants of Loropetalum chinense var. rubrum caused a significant change in its chlorophyll fluorescence characteristics including the low efficiency in the utilization of light energy conversion and the reduction of chlorophyll content, which may be important reasons for its slow growth, indicating ‘Jiaolinglong’ strain is suitable for low light environment cultivation.