As aluminum alloy is the most promising anode among various kinds of galvanic anodes from economical point of view, we have tried to make performance test on many kinds of aluminum anodes. These results are reported in this paper. Al-In-Zn alloy anode is found to be for superior to other kinds of aluminum anode. The aluminum anode is effective in use of ship hull and ballast tank excluding oil tanker. To make use of the aluminum anode in ballast tank of oil tanker, We must pay attention to the shape of anode and anode current density etc.