Abstract: The photosynthesis of five typical ecosystems in Yingtan City，Jiangxi Province was studied．The results showed that the plants in all ecosystems had some regulation in their photosynthesis capability，all plants had the highest net photosynthesis rate at 10：00 in the morning and the transpiration rate increased with air temperature rising and that the multiple agricultural ecosystem had the highest net photosynthesis rate and transpiration rate，especially，its net photosynthesis rate is above two times of that of the monocuhure．Therefore it was the pattern worthy of more researching and popularizing in the zone．