e number of carbon atoms in alkyl group from 10 to 18 and with higher yields than in the previous methods. The reactivities of antimicrobial agents onto cellulose were examined by Shake Flask Method and by Degree of Luminescence from Inductively Coupled Plasma. Ammonium salt having 16 carbon alkyl group exhibited the maximum activity. The optimum treatment conditions of these ammonium salts were : concentration 1.0% (o.w.f.), treating temperature 3$0^{circ}C$, and treating time 30 min. Si contents of treated fabrics showed the same result. Hand of the treated fabrics manifested by H.E.S.C., that is, water repellency, flame retardancy, and antistatic property was also evaluated. The results are as follows : Hand of the treated fabrics became softer and bulkier. Water repellency and flame retardancy were not changed but antistatic property became poor.