Abstract: Corrosion and electrochemical characters of titanium alloys TA28 and Ti6321 as well as ship hull steels 907A and 921A,which are employed in ship,were studied by using electrochemical methods. Experiment was carried out to investigate galvanic corrosion behavior between titanium alloys and ship hull steels in different area ratio. Resultsshow that slight galvanic corrosion would occur on ship hull when TA28 or Ti6321 are used,while a proper insolating can effectively control the galvanic corrosion between titanium alloys and ship hull steel.