全介质膜窄带滤光片因具有优良的光学性能、较强的工艺性和空间环境适应性被广泛应用于空间多光谱遥感仪器中，但锥光束入射导致的中心波长漂移问题严重影响此类窄带滤光片的光谱选择性能。为了研究光锥角对窄带滤光片透射率特性的影响，设计了非规整型全介质膜窄带滤光片，分析了高斯光束倾斜入射窄带滤光片导致透射率的变化，建立了非均匀照度下锥光束正入射时窄带滤光片等效透射率的求解模型，定量求解了等效透射率及中心波长漂移量，并对理论模型进行了实验验证。结果表明，锥光束正入射对窄带滤光片透射率的影响主要表现为中心波长的蓝移；在镀膜工艺相对稳定的基础上，理论模型的等效透射率预测精度优于中心波长的0.15%。所以，可以使用等效透射率求解模型定量计算锥光束正入射导致窄带滤光片透射率的变化，并利用中心波长漂移量修正后的设计数据指导滤光片镀膜，进而实现窄带滤光片的高精度光谱选择，这为解决介质膜窄带滤光片因锥光束入射导致的中心波长漂移问题提供了新的技术途径。

All-dielectric film narrowband filter is widely used in space-borne multispectral remote sensor owing to its excellent optical capability, manufacturability and environmental adaptability. But center wavelength shift, due to entrance light cone angle, affects its spectral selective power seriously. In order to study effects of incident light cone on transmission characteristics of narrowband filter, an informal dielectric film narrowband filter is designed and manufactured. Changes of transmission characteristics with oblique incidence of Gaussian beam of uneven illumination are analyzed. The count model of effective transmission with vertical incidence light cone is established and verified by spectral calibration. Results show that blue shift of central wavelength is the main influence of incidence light cone on transmission characteristics of all-dielectric film narrowband filter. Prediction accuracy of transmittance calculated by effective transmission model is better than 0.15% of central wavelength. Therefor, count model of effective transmission can be used to calculate the actual transmittance of film narrowband filter with oblique incidence of Gaussian beam, and spectral selective ability of narrowband filter will be improved when the reasonable film design data corrected by center wavelength shift is utilized during film coating. This provides a new technical approach to solve the problem of the wavelength shift of film narrowband filter with vertical incidence light cone.