Amino group was introduced to cellulose with reactive dichloro-s-triazine derivative at low temperature, Dichloro-s-triazine derivative was readily prepared by reaction of 2, 4, 6-trichloro-1, 3, 5-triazine and ethylenediamine of which one amino group was protected by benzaldehyde. The reaction of cellulose with dichloro-s-triazine derivative is described including effect of change in time, temperature, reaction medium and concentration of sodium hydroxide. The effect of pH on the hydrolysis of the protected amino group in dichloro-s-triazine derivative was investigated and the rate of hydrolysis was also measured.