Abstract: The primary information of waste slag of chemical industry in China, especially the chemical composition and production output, were summarized. The total metal contents in the waste slag of chemical industry in China included Fe（calibrated as Fe2O3）9030～10560 kt/a, Al（calibrated as Al2O3）3380～4280 kt/a, Ba（calibrated as BaSO4）250～380 kt/a, while Mg（calibrated as MgO）1910～2770 kt/a. As to waste catalyst in chemical industry, the contents of precious metals are higher, such as Co 100～720 t/a, Pt group 0.4～0.5t/a, Ag 130～170 t/a, Cr 600～2000 t/a. The potential pollution control，treatment technologies of waste slag and the development trends were also described. It is suggested that based on harmless treatment, the waste slag of chemical industry should be regarded as the secondary resource and be reused according to its own characteristics, among which the recovery of metals from slag is more important, comparing to the other ways, such as using as road construction and substitute materials for cement.