State Secretary of Economic Affairs Evelyn Murphy officially resigned her post yesterday to "begin forming a campaign team" in her bid to capture the lieutenant governor's seat in 1986, said Kathy O'Donnell, Murphy's press secretary.

If Murphy's bid for the second highest seat in the state results in a successful election, she will become the first woman in Massachusetts history ever to hold this constitutional office, officials said.

Dollars and Votes

In her resignation letter to Gov. Michael S. Dukakis, Murphy said, "It has been a pleasure to work with you on a strategy in creating a healthy strong climate for economic and social problems in the 1980's... I hope in the near future to continue the teamwork with you in another capacity."

She added, "I believe we are creating a future for Massachusetts which is truly fulfilling your quest for opportunity for all... we have opened doors to those who would like to serve in state government and to those who would not otherwise share in these economic times."

Murphy plans to officially announce her drive for the state house sometime next month, O'Donnell said. Murphy ran previously in 1982 for the same, position but was narrowly squeezed out by former heutenant governor and current U.S Sen. John F. Kerry (D-Mass.).

Murphy is being replaced by Joseph D. Alviani, a partner in Goodwyn, Procter, and Hoar who stepped down as president of the New England Foundation of Lawyers to accept his new position.