We report the construction of temperature and VPD (Vapor Pressure Deficit) control system. In the plant factory with solar light, the control method for temperature and VPD using fogging system was not confirmed in the previous research. We propose the control method for temperature and VPD using variable rate fogging system by VPD feedback control to improve the growing environment of the plant. We subjected evaluation and review of the system that adjusts the fogging rate based on the VPD, and performs variable fogging. As a result, it increased the tomato fruit yield about from 10% to 20% more than the control area by proposed system in summer and winter.