Abstract: 【Objective】The comparison and correlation analysis of fruit quality and photosynthetic characteristics of different varieties of avocado during harvest period were studied to provide scientific reference for the selection of cultivated avocado varieties and the improvement of fruit quality.【Method】 Three varieties of avocado such as Hass， Guiken and Taiwan T were studied as experimental materials. The biological characteristics of leaf and fruit，chlorophyll contents， chlorophyll fluorescence parameters and fruit quality indexes were measured during harvest period. At the same time， the correlation of biological characteristics between leaf and fruit， photosynthetic characteristics indexes， fruit quality indexes and chlorophyll fluorescence parameters were analyzed.【Result】There were extremely significant differences in biological characters of leaves among Guiken， Haas and Taiwan T（P<0.01，the same below）， and the ratio of leaf length to width was 1.72， 2.28 and 1.39 respectively. The leaves of Haas were slender，while the leaves of Taiwan T were wide and round. The single fruit weight of Taiwan T was the heaviest， its single fruit weight， fruit longitudinal diameter and transverse diameter were 1.19， 1.72 and 1.18 times of Guiken and 1.74， 1.64 and 1.48 times of Hass. The difference of single fruit weight， fruit transverse diameter， fruit stalk length were extremely significant among different varieties. The comprehensive quality of Hass fruit was the best，its contents of soluble total sugar， calcium， iron and potassium were the highest， which were 1.16， 2.32， 2.62 and 1.03 times of Guiken， and 1.08， 2.36， 2.81 and 1.71 times of Taiwan T. The contents of protein， magnesium and edible of Guiken fruits were the highest， which were 1.09， 1.07 and 1.11 times of Haas， and 1.40， 1.12 and 1.25 times of Taiwan T. The photosynthetic capacity of Hass was the strongest， its chlorophyll content， photochemical efficiency of PSⅡin the light（Yield）and photochemical quenching coefficient （qP）were the highest， while nonphotochemical quenching coefficient （qN or NPQ）was the lowest. The change rule of light response curve and light induction curve of different varieties were consistent， its photosynthetic electron transport rate（ETR）gradually increased and Yield gradually decreased while the light intensity increased. Correlation analysis results showed that the correlation between leaf biological characters and fruit biological characters were stronger， while the correlation between leaf and fruit biological characters was weaker. The single fruit weight of avocado was significantly（P<0.05，the same below）or extremely significantly negatively correlated with the fruit quality indexes， which had significant positive correlation with Yield and qP， and extremely significant negative correlation with qN and NPQ.【Conclusion】Hass is the best variety among Hass， Guiken and Taiwan T because of its highest chlorophyll content and best chlorophyll fluorescence characteristics and fruit quality. It is suitable for promotion in Fujian.