Abstract: Taking pepper variety ‘Guoxi 109’ as test material, and the method of field greenhouse soil cultivation was used.The effects of shade net coverage on the greenhouse microclimate and pepper plant transpiration, as well as the influence of shade net coverage on pepper growth and fruit quality were studied, in order to provide reference for improvement and promotion of shade net to cooling.The results showed that the solar radiation intensity and the greenhouse temperature in the greenhouse of the covered with black shading net with 70% light transmission were significantly reduced.At the same time, according to the Penman-Monteith model, the transpiration rate of the pepper plants in the greenhouse of the covered with black shading net with 70% light transmission was significantly lower than that of the no shading net coverage, thereby reducing the greenhouse temperature.Compared with greenhouse without shading net, the pepper yield of the greenhouse covered with black shading net with 70% light transmission increased by 39.3%,the vitamin C content increased by 21.2%,and the soluble sugar content increased by 54.7%.The use of shading in summer greenhouses could significantly improve the yield and quality of pepper fruits.