District of Columbia government and business leaders were reported yesterday to be holding stead fastly to their previous stratey of relying on congressional conferees to end an impasse on proposed convention center spending and the city government's budget for the current fiscal year.

Sen. Patrick J. Leahy (D-Vit.), chairman of the District Appropriations. Subcommittee, to dat has blocked a city request for $27 million to start work on a $110 million center near Mt. Vernon Square, which would include 300,000 square feet of exhibit space.

But Rep. William H. Natcher (D-Ky.), chairman of the companion House subcommittee, supports the convention center. Both members of Congress have refused to budge, and the city's entire budget is still before Senate and House conferees, while government services continue under Ceilings in the previous year's budget.

District Building sources said Mayor Walter Washington remains convinced that the conferees will work themselves out of the impasse and that the conferees will work themselves out of the impase and that the convention center proponents will prevail, perhaps some time this month.

John Tydings, executive vice president of the Metropolitan Washington Board of Trade, said yesterday the local business community has "no organized effort" in progress to influence members of Congress. "It would be wrong to undermine Mayor Washington," by separate lobbying efforts, said Tyding. "After all, it's the D.C. budget" that is at stake, he added.