Novel Dy3+-doped GdPO4 white light phosphors with monoclinic system were successfully synthesised by hydrothermai method at 240 ℃. This paper investigates the luminescence properties of white-light Gd1-xPO4 : xDy3+under vacuum ultraviolet (VUV) excitation. The strong absorption at around 147 nm in excitation spectrum energy can be transferred to the energy levels of Dy3+ ion from the host absorption. Additionally, this white light phosphors are activated by a single Dya+ ion and with a lower preparation temperature, which tend to decrease the consumption of rare earth resource and energy. Therefore, the luminescence of Gd1-xPO4 :xDy3+ under VUV excitation is effective,and proves to be promising in application to mercury-free lamp.