In screening high-production and resisting high- temporature mutant of cellulase Trichoderma viride of N0 were mutagenized by the UV, NTG mutagenic agents. From the selected mediums containing CMC as sole carbon source and 20U nystatin ,we selected some strains with lager HC value(ratio of diameter of clearing zones and colony )than that of T0 . These selected strains were repeatedly screened by measuring CMCase and FPA activity of fermentating solide in different temporature.