The principle of soft x-ray slit transmission grating spectrograph is introduced in this paper and the resolution calculation formula can be obtained. Simultaneously

the geometry structure and corresponding parameters are given. On the condition of vacuum

some experiments on target shooting for different materials are carried out. The soft x-ray spectrograms of different materials are gained and from these spectrograms

we can conclude the spectroscopy and do some plasma diagnoses. Some good spectrograms are chosen from the result and are scanned by microdensimeter. From it

the relationship between the light intensity and the distance can be gained. It can be used in demarcation experiment and some quantitative analysis on elements.