The study content of this paper is divided into two parts. First, study on the photosynthetic characteristics of different Chrysanthemum varieties: taking 10 Chrysanthemum varieties as materials, this experiment comparatively studied the photosynthetic characteristics of different Chrysanthemum varieties using portable CIRAS-2 photosynthetic system, revealed their photosynthetic physiology characters, analyzed the relationship between photosynthetic physiology characters difference and environmental factors...