In order to solve problem of the strain measurement limitation under high temperature, the temperature and strain characteristics of the type II pure-quartz-core fiber Bragg grating (FBG) written by femtosecond pulse laser are studied. Experimental results show that when the temperature is ranging from 20 ℃ to 1000 ℃, the pure-quartz-core FBG exhibits good linearity with the correlation coefficient of 0.9996 and the temperature sensitivity of 14.07 pm/℃. When the temperature is under 400 ℃, the pure-quartz-core FBG exhibits good wavelength stability under the uniform strain. When the temperature is above 500 ℃, the strain loading leads to fiber elongation and the red shift of the center wavelength.