A biological process is a cost effective method and are frequently applied for the decolourisation of textile dyes.Decolourisationof methyl orange and methyl red by live and dead biomass of fungi was studied. Three different fungi including Aspergillus niger, Trichoderma viridae and Penicillium verrucosum were evaluated for proportion of decolourisation of methyl orange and methyl red.Biodegradation of dyes is extremely difficult; therefore research is carried out on this subject.