Abstract: In order to achieve a quartz filter insensitive to incident angles, based on the principle that the shifting direction of output central wavelength of a quartz birefringent optical filter is different when the filter rotate around an axis parallel and perpendicular to the quartz optical axis, a new type of two-stage modified Lyot quartz filter was presented. After theoretical analysis and experimental verification, the results show that the central wavelength of this new type filter is actually insensitive to the incident angles less than 18. The conclusion is in good agreement with the experiment results.