U.S. Conference of Mayors President Richard E. Carver attempted restore peace to his organization yesterday by reappointing two black committee chairmen he had removed from office.

The two, Coleman Young of Detroit and Maynard Jackson of Atlanta, were the only blacks heading committees in the conference, a lobbying group that represents cities with populations of 30,000 and over.

Aides to Young said yesterday that he would accept his reappointment to the urban economics policy committee, which he founded and had directed for the past three years.

But Jackson, coming out of a private meeting here yesterday with Carver and seven other members of the conference's executive committee, said he would not resume his job as chairman of the committee on the arts.

Carver had replaced both Young and Jackson, influential big-city Democrats, with mayors from smaller, Sunbelt cities. The action prompted charges that Carver, a Republican and candidate for the Senate in Illinois was racially insensitive and biased in favor of smaller cities.

Carver is mayor of Peoria, Ill. since assuming the conference presidency last June, Carver has disagreed publicly with the heavily Democratic, big-city mayor's group on policy matters like energy production and conservation. Those disagreements led to charges from some of his colleagues that Carver was trying to use the mayors' group as his personal political vehicle.

Yesterday's meeting, described by one conference insider as a session in which Carver "was worked over pretty good with hard rubber gloves," was called to resolve those differences.

Carver, apologizing for any misunderstanding occasioned by his actions, said the session worked out well. Jackson agreed.

"We have unity," the Atlanta mayor said.