Abstract: A time and spaceresolved flatgrating spectrometer is developed. It is composed of a varied linespace grating with 2 400 lp/mm or 1 200 lp/mm, a gated MCP framing camera and an optical CCD system. The principle, the construction and adjustment method of the spectrometer are presented. With this spectrometer the timeresolved emission spectrum of Al plasma are measured in “Xingguang” laser facility and the time and spaceresolved absorption spectrum of Al plasma is observed in “Shenguang” laser facility respectively. The spectrum resolution is about 0.02~0.05nm.