More than half the money spent by Boston Mayor Kevin H. White's campaign committee last year went to his wife as a consultant's fee and to improve his home, which served as his campaign headquarters, according to his committee's financial disclosure report.

White, the nation's longest-serving big city mayor, raised $374,120 in 1982 through the Kevin White Committee, the report said.

Seven payments totaling $26,000 were made in 1982 to Kathryn G. White, his wife, as a consultant, according to the report filed this week by the White committee.

The campaign committee also spent more than $10,000 refinishing and furnishing the basement of the Whites' Beacon Hill town house for use as a campaign office.

The committee has asked the state to determine if that expenditure, which included $2,700 for a leather sofa, was legal.

The payments to Mrs. White and for the home improvements represented about three-fifths of the $59,515 spent by the White committee in 1982, according to the committee's year-end report.

A spokesman for the Democratic mayor said Thursday that Mrs. White apparently was paid by the campaign committee for her work as a consultant on elderly affairs. Mrs. White and the mayor's son, Mark, also received $25,000 in campaign funds as consultants in 1981, the committee reported.