Etherification of jute fibre with butyl chloride was carried out at a temperature of 300C for a period of 2 hours in different solvents. Sodium hydroxide was selected as swelling agent for cheap and availability. Petroleum ether was used as a solvent in this research. The degree of substitution, the percent elongation, and bundle strength and moisture regain of the butyl substituted jute fibre was studied. It is observed that the bundle strength of the butyl substituted jute fibre decreases and percentage of moisture regain of the butyl substituted jute fibre decreases with the increases of substitution. The extensibility of the butyl substituted jute fibre increases up to about 10 times of its original value of 1% extension at break with the increase of substitution.