Abstract: In order to find out the characteristics of Summer Microclimate in Vegetable Cultivated Facilities, the temperature and relative humidity inside and outside the insect-proof screens as well as rain proof shelter was detected. The results showed that, there was less difference on average temperature between inside and outside facilities. The facilities temperature increased faster, and the daytime temperature was higher than open field, but the highest temperature difference was bellowed 2℃ between inside and outside. The temperature was similar inside and outside facilities in the evening. The relative humidity was much difference between inside and outside facilities. The relative humidity was high during daytime and evening in rain proof shelter, and low in daytime but high in evening in the insect-proof, while there was always low in open field. There was small change of relative humidity in the rain proof shelter, while the change was large in the insect-proof and open field, through compared the maximum and minimum relative humidity. Therefore, the temperature in the rain proof shelter and insect-proof was similar to open field, both facilities are suitable for summer vegetable cultivation in south China. Choosing the right facilities depend on the plant requirement, while the rain proof shelter do reduce the rain, and insect-proof can reduce the insect and disease.