To reduce the measurement errors of the Haar wavelet analysis in large-scale, analyze the characteristics of the generalized Haar wavelets and some kinds of the quasi-Haar wavelets and compare each of them with the Haar wavelet. Both of them have inherited most characteristics of the Haar wavelets, but the quasi-Haar wavelets have better frequency attenuation characteristics. Simulate LFM and BPSk signals. The simulation result shows that the quasi-Haar wavelet is the better choice in analyzing some kinds of signals than the generalized Haar wavelet. It can provide reference for researchers choose the suitable wavelets wisely.