In the premise of fulfilling the application requirement ,the adjustment of spectral resolution can improve efficiency of data acquisition ,data processing and data saving .So ,by adjusting the spectral resolution ,the performance of spectrometer can be improved ,and its application range can be extended .To avoid the problems of the fixed spectral resolution of classical Fourier transform spectrometer ,a novel type of spatial modulation Fourier transform spectrometer with adjustable spectral resolution is proposed in this paper .The principle of the novel spectrometer and its interferometer is described .The general expressions of the optical path difference and the lateral shear are induced by a ray tracing procedure .The equivalent model of the novel inter-ferometer is analyzed .Meanwhile ,the principle of the adjustment of spectral resolution is analyzed .The result shows that the novel spectrometer has the merits of adjustable spectral resolution ,high stability ,easy assemblage and adjustment etc .This the-oretical study will provide the theoretical basis for the design of the spectrometer with adjustable spectral resolution and expand the application range of Fourier transform spectrometer .%调整光谱仪的光谱分辨率，可使光谱仪在满足不同目标测量需求的同时，减少数据采集、处理和存储的时间，提高仪器的整体性能。为克服传统傅里叶变换光谱仪的光谱分辨率固定的缺点，提出了一种分辨率可调的空间调制傅里叶变换光谱仪。介绍了该新型光谱仪及其干涉仪的工作原理，利用光线追迹的方法推导了光程差和横向剪切量的计算公式，并分析了新型干涉仪的光程等效模型。在此基础上，分析了光谱分辨率的调节原理。结果表明，该光谱分辨率可调的新型空间调制傅里叶变换光谱仪克服了传统光谱仪分辨率固定、稳定性差等缺点，具有分辨率可调、高稳定性、结构灵活和易于装调等特点。该研究内容为分辨率可调的干涉光谱仪的设计提供了理论基础，扩展了傅里叶变换光谱仪的实用范围。
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