To identify the composition of cellulase produced by Trichodermakoningii,ammonium sulfate precipitation,DEAE-sepharose FF anion exchange chromatography and sephadex G-75 gel filtration chromatography were used for purification of the cellulase. The molecular weight and purity were determined by SDS-PAGE,and the protein was identified by MALDI-TOFMS. A new endo-β-glucanase was identified with its molecular weight of 44 600 and the specific activity of 19. 65 U / mg. The optimum p H and temperature for the en...