[Objective]In order to explore the law of photosynthesis,with Zaoba pear and Yuluxiang pear,the most representative new varieties,as the research object.[Methods]The photosynthetic indexes(including net photosynthetic rate,transpiration rate,stomatal conductance and intercellular CO_2concentration)of two pear varieties were determined by portable photosynthesis system Li-6400.[Results]The results showed that net photosynthetic rate of Yuluxiang pear was higher than Zaoba pear's under the same light intensit...