The Principle and characteristics of the sauce-resolving grating spectrograph are discrital in this peper, emphasis on the pre-optics for collecting radiation and compellsating for astigmatism. The method for measuring the spatial resolution and the results obtained are presented and the well Weement is found between the experimental results and the ray-tracing simulation results. Applications of the spectrograph in laserPtoduced plasma spectroscopy and X-ray laser study are discussed briefly.