Thulium, terbium, and manganese tridoped phosphate glass ceramic was prepared by high-temperature melting method and heat annealing technology. The sample can emit strong white light under 355 nm excitation. The luminescence intensities and peak positions keep unchanged in the temperature range of 25–300°C. The phosphate glass ceramic material shows good property of thermal stability, which can be exploited for the phosphor of white-light-emitting diode.