Applicability of electrodeposition method for repairing method of deteriorated by sea water was studied. A series of in site and laboratory test were carried out. From these study, the following conclusion were obtained.
(1) One to two millimeter thick dence electrodeposit which consist of mainly CaCo3 and Mg(OH)2 was observed on the concrete surface after appropriate amount of direct current was supplied.
　Cracted portion of concrete were filled preferentially with electrodepostion of minerals.
(2) After current supply, the coefficient of water permeability of concrete was improved to 1/40 of the value of original concrete.
(3) The procedure of electrodeposition has effects on reduction of chloride content in concrete around reinforcing bars.
(4) The procedure of electrodeposition method did not affect the bond strength of reinforcing bar embedded in concrete in the limit of current density below 0.75 A/m2 which is the range of practical use.