Abstract: Runnig in oil dock a towboat is to drag a boat loading class Ⅰ of oil besides safety keeping on water in the oil dock, it is asked to be not only flexible in running, but also safe, reliable, as well as able to extinguish the begining of fire harzard on tow boat. An additional fire fight facilities should be installed on tow-boat with larger power, manipulating in remote control (reservation of manual operation for backup), control room in boat cabin to manitor operation conditions of prime machine, auxiliary and other facilities, light and audible alarms and communications, variable spiral pitch propeller. At last the author presents the maximum prime power of two boat suitable for docks along Chang Jian river and basic technic data of towboat.