Abstract: In allusion to the phenomenon of corrosion and holiday of heating coil pipe in the crude oil tank at TuHa Oil Tankfarm, an analysis on physical properties is carried out for water, boiler water and condensation water. It is pointed out that the major reason for heating coil pipe's corrosion in crude oil tanks is the result affected in the combination of CO2 corrosion, electrochemical corrosion and oxygen corrosion. The countermeasures for reducing CO2 corrosion are presented and suggestions for installing deoxidization equipment, preparing deoxidization water for boiler to inhibit oxygen corrosion are provided.