Former Massachusetts Sen. Paul Tsongas has taken another step toward entering the 1992 presidential race, filing a declaration of candidacy with the Federal Election Commission.

The filing this week comes as Tsongas tests the waters for a Democratic candidacy.Tsongas, the first major Democrat to file for the 1992 race, was in Washington this week to meet with party leaders, including a session with Democratic National Chairman Ron Brown.

Tsongas is mailing to reporters and party officials hundreds of copies of his platform, an 83-page document in which Tsongas articulates his views on economic policy, education, the environment and energy and foreign policy.

Despite filing his candidacy declaration and a separate document naming Massachusetts accountant S. George Kokinos as treasurer of The Tsongas Committee, Tsongas cannot be recognized legally by the FEC as an official candidate until he reports raising $5,000.

Tsongas, 50, left the Senate in 1984 to battle lymphoma. After getting a clean bill of health, Tsongas pondered running for governor of Massachusetts last year but decided against it. He currently is a partner in the Boston law firm Foley, Hoag & Eliot.