Abstract: 142^# tank inclined after it had been modified to an annular-cabins-type inner floating roof tank, Due to the heavy pontoon roof, the inclination correction is divided into two steps; firstly, make the pontoon stands on the inclined side set on the tank pad, correct the tank with sands blowing method; secondly, lift the pontoon roof with jacks, and repair the tank bottom, and next carry out a water test until qualification, in final reinstall the accessories of tank, by which a predicted result in inclination correction has been received.