A method of multi-algorithm fusion real time filter was researched on the basis of the characteristic of the output signals of fiber optic gyros(FOGs),Mallat wavelet transform theory and the requirements of FOG in the application environment.The IIR filtering is adopted to deal with the signal while the data is few in the initial sample time,a moving window is adopted to realize the wavelet real time filter,and period symmetry extend method to eliminate the problem of the boundary.The method can eliminate the high frequency noise,and the random drift is restrained.Experimental results show the feasibility and efficiency of the method in FOGs signals de-noising.