Erbium-doped superfluorescent fiber source technology is one of the key technologies of the high-precision fiber-optic gyroscope （FOG）.The performance of the source influences the FOG＇s scale factor and bias stability directly. Based on the optimum Erbium-doped fiber length has been fixed, the experimental investigation of the influence of pump power＇s fluctuation on DPB SFS＇s mean wavelength and linewidth were presented. Meanwhile the shifts of mean wavelength, linewidth and output power with temperature for several pump power were measured in this work by rapidly cycling the soure temperature between -20-60 ℃. The experimental results are as follows, when pump power in the range of 60-120 mW, the influence of pump power＇s fluctuation on DPB SFS＇s mean wavelength is -6.5 ppm/mW.Appropriate pump power can be selected in this range. Finally, the sample＇s mean wavelength stability reached 5 ppm（peak-to-peak）in 6 h,it can reach 2 ppm for short time （1 h）.The proper fiber Bragg grating to tailor the ASE spectrum are designed so that the width and shape of the spectrum can satisfy the high-precision FOG＇ s request.