Jackson R. Champion, the Republican candidate for mayor in the District of Columbia's first home-rule election in 1974, announced yesterday that he would seek the post again this year.

Champion announced his intention to reporters in the District Building press room.

As the second Republican to announce his candidacy, he will run against Arthur A. Fletcher, a former assistant secretary of labor, in the Sept. 12 primary election.

In 1974, Champion received 3,501 votes of a total of about 100,000 cast for six candidates on the ballot. The winner, Walter E. Washington, received about 80,000 votes as the Democratic nominee.

Champion, 55, a native of South Carolina, was reared in New York and attended Howard University. He formerly owned a beauty supply business and was a member of the governing board of the former Washington Technical Institute, now part of the University of the District of Columbia.

"This is going to be a people's campaign, and I know that's unfamiliar words coming from a Republican," Champion said. "I'm a different kind of Republican. I'm black, I'm American and I believe that we ought to pay more attention to teaching people skills to earn a living."

He said he would base his campaign on "finding unregistered Democratic and Republican voters who are interested in self-determination and are dissatisfied with the Democratic administrations, both here in the city and nationally."

Champion said he had established campaign headquarters in his home, 607 Fourth St. SW.