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本文指出了传统的光栅分辨本领Ｒ＝ｋＮ只是在光源狭缝无限细的情况下的极限值。当光源狭缝还有一定宽度Ｗ时，衍射条纹将增宽，相应最小分辨角Δθｋ将增大，实际光栅系统的分辨本领将减小。文章运用衍射理论，给出了实际光栅系统分辨本领的修正公式。在实验中，在不同光栅宽度Ｄ的情况下，用ｋ＝１级衍射条纹，当测量恰能分辨钠黄光的双线结构的光源缝宽Ｗ时，这时光栅系统的分辨本领是λ／δλ≈１０００，与修正公式计算的理论值一致。
This paper points out that the traditional grating resolution R = kN is only the limit value under the condition that the slit of the light source is infinitely thin. When the light source slit has a certain width W, the diffraction fringes will widen, the corresponding minimum resolution angle Δθk will increase, and the resolution capability of the actual grating system will be reduced. The article uses the diffraction theory, gives the correction formula of the actual grating system resolution skills. In the experiment, with different grating width D, using k = 1 order diffraction stripes, when measuring the slit width W of the light source which can exactly distinguish the two-wire structure of sodium yellow light, the resolving power of the grating system at this time is λ / δλ≈1000, which is consistent with the theoretical value calculated by the correction formula.