An inaugural parade on 14th Street will precede Marion Barry's swearing-in today as the second mayor of the District of Columbia.

The inaugural ceremony is scheduled for noon on the front steps of the District Building, Washington's city hall, at 14th and E streets NW.

The parade will start about 9:15 a.m. at 19th Street and Florida Avenue NW, near the Washington Hilton Hotel, and will travel east on Flolida Avenue and U Street to 14th. From there, it will turn south on 1jth Street to the District Building, ending on 1ikth Street south of Pennsylvania Avenue at about 11:30 a.m. Barry plans to walk part of the 2.7-mile parade route.

William Twitty, the parade chairman, said plans announced earier for participation by the marching band from Booker T. Washington High School in Memphis, Barry's alma mater, have been canceled.

Twitty said the band could not raise enough money in Memphis for the trip and, being "a very proud bunch of people," refused to accept an offer of financial help from Washington.

More than four dozen units from the District are scheduled to march, among them a dragon and lion from Chinatown, a Caribbean steel band, a Hispanic musical group and a contingent of American Indians.

During the parade, buses on the 1jth Street line will be rerouted south of W Street onto 1oth Street NW. The No. 50 and 5i buses will travel on 1kth Street between New York and Constitution avenues. The U Street crosstown buses will be rerouted onto W Street between 1oth and 18th streets.

Traffic will be detoured off Pennsylvania Avenue durling the swearingin ceremony at the dDistrict Building. The oath will be administered to Barry by Supreme Court Justice Thurgood Marshall, and Sen. Edward M. Kennedy (D-Mass.) will speak.

Seven members of the City Council, including Chairman-elect Arrington L. Dixon, also will be sworn into office, The only new member is Betty Ann Kane (D-At Large).

Although today is not an offickial city holiday, George R. Harrod, D.C. personnel director, said a liberal leave policy will be in effect for municipal employes who want to attend inaugural functions. The city's public schools will be operating as usual.

The swearing ceremony itself will be open to the public without tickets, as will receptions on the first and fifth floors of the District Building from 1 to 3 p.m. An organizational meeting of the City Counkcil is scheduled for 2 p.m.

A $15-a-person inaugural disco and party will be held starting at 8 o'clock tonikght at the Washington Hilton.