Abstract: 【Objective】 To study leaf characters and the diurnal variation photosynthesis of excellent single plant of Xinjiangpeach， hoping to provide a theoretical basis for efficient cultivation and management techniques of Xinjiang peach. 【Methods】 By using the methods of field investigation and ethanol extraction， the attribute characteristics， morphological characteristics and chlorophyll contentof leaves were analyzed， and the diurnalvariation of photosynthetic physiological indexes wasmeasured by Li-6 400XT portable optical cooperation instrument， and the diurnal variation of photosynthetic characteristics of 7 Xinjiang peach superior plant was analyzed. 【Results】 The results showed that：the leaf shape， leaf tip shape and leaf base shape of 7 Xinjiang peach superior plant were different. The leaf color of 7 Xinjiang peach superior plant was green， and the leaf edge shape was obtusely serrated；the total chlorophyll content of Maotao 3 was the highest， which was 3.75 mg/g. The leaf morphological characteristics of Xinjiang peach superior plant were significantly different， and the leaf area was in the following order：Maotao 2>Maotao 3>Youtao 2>Youtao 1>Maotao 5>Maotao 4>Maotao No. 1；the diurnal variation trend of net photosynthetic rate of 7 Xinjiang peach superior plant showed ‘double peak curve'， and the time of reaching the peak value of different superior plantwas different. the order of net photosynthetic rate was Maotao 3>Maotao 4>Maotao 2>Youtao 2>Maotao 5>Maotao 1>Youtao 1；the diurnal variation trend of stomatal conductance of 7 Xinjiang peachsuperior plant showed a ‘bimodal curve'. The daily average value of stomatal conductance was in the following order：Maotao 2>Maotao 3>Maotao 4>Maotao 5>Youtao 2>Maotao 1>Youtao 1；the diurnal variation of intercellular CO₂ concentration of 7 Xinjiang peach superior plantshowed ‘U shape， and the average diurnal variation was in the order Maotao 4>Maotao 5>Maotao 2>Maotao 3>Maotao 1>Youtao 2>Youtao 1. 【Conclusion】 Comprehensive analysis showed that there were great differences in leaf characters and photosynthetic characteristics of 7 Xinjiang peach superior plant. according to the analysis of net photosynthetic rate，Maotao 3 had strong photosynthetic capacity.