In the recent years,the rice varieties or hybrids with erect and semi-erect panicle have been planted in large scale in Liaoning Province.In this article,the correlations between photosynthetic characteristics and yield as well as quality of rice varieties with erect and semi-erect panicle at yield formation stage were demonstrated.The photosynthetic characteristics,yield,and quality traits of 27 newly bred rice varieties in Liaoning Province were studied in two years on many locations.Results showed that there existed conic relationship between photosynthetic rate and stoma conductivity as well as evaporation rate,and there existed very significant linear relationship between photosynthetic rate and intercellular CO₂ concentration.The net photosynthetic rate of leaves at middle filling stage was significant positive related with yield,and stoma conductivity and evaporation rate were positively correlated with ripened grains per panicle.Regression analysis indicated that the yield increased as the photosynthetic rate promoted and these two characters presented power exponential function relation.