Chirped Fiber Bragg Grating (CFBG) has the characteristics of small nonlinear effect, large dispersion range, and easy control. It is widely used as a dispersion control element in fiber femtosecond laser systems for precise dispersion management. The spectral and dispersion characteristics of CFBG directly determine the pulse stretching effect. Accurately measuring the dispersion of CFBG is not only an essential basis for the preparation and optimization of high-quality CFBG, but also an important means to evaluate their quality. Therefore, it is necessary to study the fabrication and dispersion measurement techniques of CFBG. This paper proposes a method for fabricating CFBG and measuring its dispersion to achieve higher precision in dispersion measurement.A large dispersion CFBG for pulse stretcher in the 1 μm is fabricated using a linear phase mask combined with beam scanning exposure technology. Based on the dispersion measurement principle of Michelson white light interferometry, a method combining wavelet threshold denoising and Extended Kalman Filtering (EKF) is proposed to achieve accurate dispersion measurement for a large dispersion CFBG.A large dispersion CFBG designed for pulse stretcher in the 1 μm is simulated (Fig.4), and a CFBG with a central wavelength of 1035 nm, a bandwidth greater than 30 nm, and a reflectivity of approximately 90% is fabricated (Fig.5). The large dispersion CFBG is connected to the dispersion measurement system, and the high-frequency noise in the signal is filtered out using wavelet threshold denoising (Fig.8), The interference spectrum and phase estimation is realized by combining EKF (Fig.9). After multiple measurements, the dispersion value is 20.9283 ps/nm@1030 nm, with a maximum error range within ±0.025 ps/nm (Fig.10). To verify the accuracy of the method, the traditional Fourier Transform (FT) is used for comparison (Fig.11). By comparing the error range and standard deviation of the two methods (Fig.12), it is verified that the method proposed is more effective and accurate.A high-reflectivity CFBG with a central wavelength of 1035 nm, a 3 dB bandwidth greater than 30 nm, and a reflectivity of about 90% is fabricated by combining linear phase mask technology with beam scanning exposure technology under long grating conditions. A method combining wavelet threshold denoising and EKF is proposed for dispersion measurement based on Michelson white light interferometry. Multiple measurement results show that its dispersion value is 20.9283 ps/nm@1030 nm, with the maximum error range within ±0.025 ps/nm. Compared to the traditional FT method, this method proves to be more effective and accurate. The fabricated large dispersion CFBG and its dispersion measurement method are expected to be applied to the pulse stretcher in all-fiber femtosecond laser systems. If combined with the correlated dispersion tuning technology, it has potential application prospects in precise dispersion management in the CPA systems.