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The mechanism of crosstalk phenomena in the shortwave infrared (SWIR) subsystem of the Advanced Spaceborne Thermal Emission and Reflection Radiometer, which has six bands in the wavelength region of 1.6-2.43 μm, is investigated. It is found that light incident to band 4 is reflected at the detector and the filter boundary, and then transported to other bands by multiple reflections in the focal plane area. A crosstalk correction algorithm is developed to improve the spectral separation performance of SWIR. Parameters of the crosstalk model, i.e., the amount of stray light and its area of influence, are determined by image analysis. By careful investigation of SWIR images around peninsulas, lakes, and islands, the crosstalk model is validated. Therefore, the correction algorithm is implemented in the preprocessing of higher level data products.