The distribution of glycogen, polysaccharide, mucopolysaccharide, lipid and nucleic acid has been studied in Echinorhynchus gadi(Acanthocephala). The results were summarized as follows: 1. Glycogen and polysaccharide was demonstrated by Bauer PAS reaction technique and was found in fertilization membrane in ovum, central nuclear mass in acanthor and lemnisci, hypodermis in cystacanth. 2. Mucopolysaccharide was demonstrated by Mowry alcian blue staining technique and was found in outer membrane, fibrillar coat, fertilization membrane and inner membrane in acanthocephalan ova. 3. Lipid was demonstrated by Smith Nile blue stain and Lison Sudan black B staining technique and was found roughly parallel to that of polysaccharide. 4. Nucleic acid was demonstrated by Rosenbeck Feulgen reaction, Taft methylgreen-pyronin stain and Diengdoh acridine orange staining technique and found in central nuclear mass in acanthor, also, was found in lemnisci, proboscis and hypodermis in cystacanth.