The chirp of sampling period is applied for balancing one channel’s DC component of apodized sampling grating. This method has the advantages that wavelength design is flexible and unrestricted to phase mask period, and just a single exposure and a sub-micrometer precision are needed. Maximum reflectivity model and reflectivity notch bandwidth model of uniform grating are used to obtain the relation between UV photo-induced index increment of single mode hydrogen loading fiber and its dose. Based on this method, cosine apodized grating filters with central wavelength of 1549.84 nm, 3 dB bandwidth of 75 pm and 55 pm respectively, are fabricated. The results indicate that experimental and simulation data are coincided well, F-P resonance in high frequency side and the unbalance of -1st reflection and transmittance spectrum are totally eliminated, and the suppression of reflection sidelobes is beyond 20 dB.