The vacant house use project which cities grapple with is made the research object, and the four cases of the repaired residence used ”the subsidy system of the improvement cost”are reported .Though the average of the improvement cost is about 1000000 yen, a minimum is 400000 yen, and the difference in amount of money of the maximum is big with 1710000 yen. The exchange of the flooring,tatami, wall,shoji, fusuma were being done in common. As for the equipment of the rest room, bathroom and kitchen, the case that it wasn't repaired exists. And, the antiseismic reinforcement and the repair of heat insulation weren't being done with all cases.