Abstract: Abstract: This paper aims to find out the regulator metabolism of salicylic acid on cold resistance in dormancy of tea tree. Effects of difference concentration of salicylic acid on photosynthesis, carbohydrate content and metabolism of reactive oxygen species in Longjing43 were studies. Results showed that net photosynthesis rates were obviously increased in 30th day after sprayed salicylic acid to tea foliar in dormancy. 2 mmol?L-1 salicylic acid significantly increased total soluble sugar, starch contents, and significantly decreased foliar reactive oxygen species and MDA contents in 60th day after treatment. At the same time, the proline content, SOD, CAT and POD activities were significantly increased. Others concentration of salicylic acid also improved photosynthesis and protective enzymes activities, but the results were not as better as 2 mmol?L-1 salicylic acid. It is concluded that foliar sprayed of suitable concentration of salicylic acid in tea tree’s dormancy can improve photosynthesis and protective enzymes activities, and increase the cold resistant, in the end, the tea yield and quality in the next year could improve.