V-I transfer matrix method is used to analyze phase-shifting,phase-shifted point position and the influence on phase-shifted fiber Bragg grating (FBG) transmission spectrum characteristic from chirped coefficient. The wavelength spacing of the multi-notch filter generated by inserting multiple phase shifts into the chirped FBG is analyzed. It is similar to the wavelength shifting spacing of the notch filter,which inserts single phase shifting at the same position. According to simulation results,chirped phase-shifted grating shifting number,position interval,chirped coefficient and phase-shifting can be chosen optimally to design the applicable multi-wavelength filter.