In the present work has been performed the investigations of nonlinear properties of photorefractive quartz crystal in wide range of temperature (20-800°C). The temperature behavior of Raman spectra have been observed in frequency range of 0-300 cm-1. The intensity of mode 206 cm-1(in maximum) undergoing the knee near 400°C. At the temperature of α-β phase transition (573°C) this line decreases and appears in the β-phase. Intensity of the line 266 cm-1 linearly decreases at increases of temperature. The modes of 147 and 128 cm-1 coincide at 406°C and undergoing the maximum of light scattering at this temperature. It can be made conclusion that at range of 400°C was discovered the new phase transition of second order