An imaging spectrometer in the short infrared waveband of 1.0-2.5 μm was obtained for the precision agriculture observation by air. The scientific performances parameters of the imaging spectrometer were analyzed for the requests of the precision agriculture. The perfect astigmatism corrected conditions were obtained based on the advanced Dyson imaging spectrometer. The enough axial and lateral spaces among each parts of the system guaranteed the arrangement of mechanisms of the slit, the detector and the optical elements. An imaging spectrometer with high optical performances as F number 1.5, the field of view 28°, the slit length 25 mm, the spectral resolution 12.7 nm and the spatial resolution 1 mrad was designed. The aberrations were totally corrected and the tolerances of the system were loose. The research will be helpful for application of precision agriculture remote sensing.