Abstract: Taking ‘Golden Pear’‘Hongxiangsu’‘Whasan Pear’ and ‘Zhongli No.1’ as test materials.Their growth parameters,physiological indicators,leaf phenotypic parameters and photosynthetic characteristics were compared and analyzed in order to study the growth and photosynthetic characteristics of different pear species in Linzhi,Tibet,with a view to providing scientific basis for the adaptability evaluation of pear trees in the Tibetan Plateau and the selection of introduced species.The results showed that ground diameter of the ‘Golden Pear’ varieties was significantly higher than those of the other three varieties,and the degree of change was lower;with the increase of photosynthetic effective radiation,the net photosynthetic rate of the four varieties increased first and reached the peak.Later,it showed a downward trend,among which the varieties of ‘Golden Pear’ was significantly higher than the other three varieties;the principal component analysis screened the ‘Golden Pear’variety with the highest comprehensive evaluation score.The ‘Golden Pear’variety had high photosynthetic production potential,and had good growth performance and photosynthetic characteristics under extreme environmental conditions such as high altitude,low temperature,and strong radiation in the Linzhi area of Tibet.