A study has been made to explore the behavior of photo dielectric effect in the compound of magnesium titanate and zinc oxide. The heat treatment method is used to prepare the mixed composite. The composite is prepared by heating the mixture (ZnO and MgTiO3) at temperature 650 0 -950 0 C in a cylindrical furnace for 45 -55 minutes. The sensitive material is sandwiched in between the parallel plate capacitor. The variation of conductance (G), capacitance (C) and loss factor (tan) with different temperature is observed.