Abstract: Studies have shown that the color of plant community can affect the mood of sitting people, but the impact on exercisers has not been studied. This study used psychological questionnaire to investigate the emotional changes of subjects before and after watching plant community color pictures in three exercise states: running, walking and sitting, in order to explore the influence of plant community color on the mood of people in different exercise states. The results show that among the five colors of flower of white, pink, yellow, purple and mixed color, the best one to produce calm mood is white flowers, and the best one to generate happiness is mixed color flowers. Pink flowers can relieve tension and sadness most. White flowers can also ease tension in walking state, and mixed color flowers can also reduce tension and sadness in sitting state. Among the five leaf colors of red, orange, yellow, green and mixed color, the green leaves are the best to evoke calm mood, the yellow leaves are the best to trigger happiness and excitement in running state, and the mixed color leaves are the best to stimulate happiness in walking and sitting state; The yellow leaves are the most likely to generate excitement during running, the orange leaves are the most likely to generate excitement during walking and the red leaves are the most likely to generate excitement during sitting. Green leaves are the best to relieve tension and sadness in running state, green leaves and mixed leaves ease tension and sadness in walking and sitting state respectively. The results will provide a reference for the planning and design of plant communities in fitness green space.