Department of Chemical Engineering. Taiyuan University of Technology, Taiyuan, Shanxi 030024, P.R. China Manuscript received 10 May 2007, revised 14 November 2007, accepted 22 January 2008 Isolation and purification of phenanthrene from phenanthrene waste has been studied by fractionation, recrystallization and precipitation. GC apparatus was used to investigate the purity of phenanthrene. Experimental results showed that the purity of phenanthrene was increased from 50.29% to 90.32%. And commercial grade phenanthrene was obtained by purification, the melting point of the product was 96-98 ºC, and the yield of phenanthrene 54.3%.