Abstract: The content of chlorophyll content， the botany characteristics and photosynthetic characteristic of Ouxiu806 (variety A) and Haoweisite (variety B) were compared， the results showed that the content of Chla， Chlb and Chl(a+b) of variety A were higher (P＜005)， while the Chla / Chlb ratio was lower (P＜005). The photosynthetic rate of two varieties increased with increasing CO2 concentration， and there was no significant difference under higher CO2 concentrations of 450， 550 and 650 μmol·mol-1. At low CO2 concentration (350 μmol·mol-1)， the maximum photosynthetic rate of variety B was higher (P＜005). At high CO2 concentrations (450， 550 and 650 μmol·mol-1)， the light saturation point of variety B was lower (P＜005)， which might be caused by the lower content of Chla， Chlb and Chl(a+b) in variety B. There was no significant difference in apparent quantum efficiency (AQE)， dark respiration (Rn) and light compensation point (LCP). The early yield of variety A was 1 4568 kg·667 m-2， lower than variety B (P＞005)， but the total yield was significantly higher in variety A， which was 7 245 kg， 582% higher than variety B， which could be due to the higher incidence of TYLCV in variety B in the later period.

Key words: tomato, TYLCV, chlorophyll, botany characteristics, photosynthetic characteristics