President Reagan yesterday warmly received Chadian President Hissene Habre at the White House and reportedly assured him of continuing U.S. economic and military aid in his drive to oust the remnants of the Libyan Army occupying northern Chad.

Habre, here on his first official visit, said in prepared remarks following their meeting and lunch that he feels "great gratification" that Reagan had reaffirmed "the determination of the United States to help Chad complete the national liberation task."

"As you yourself have stressed so aptly," Habre said, "Chad remains under {Libyan} threat and must pursue its fight in order to put an end once and for all to encroachments upon our freedom and in order to live in peace."

A senior administration official said Reagan had "made it clear" that U.S. aid, which totals $45 million, including an additional $10 million in emergency military assistance in March, will continue "in the months and years ahead." But he did not say specifically that Reagan had committed the United States to helping Habre push the remaining Libyan Army out of northern Chad.

He also said there had been "considerable discussion about the Libyan threat" during the meeting, adding that "it is not over."

Calling Libya "an outlaw state," Reagan had high praise for the Chadian Army's victory and said Habre's accomplishments are admired "by the free world and will benefit all of Africa."

He said Chad and its neighbors must remain vigilant "against new {Libyan} threats." But he added, "Chad now knows it can count on its friends."

In addition to $15 million in emergency military aid last December, the United States helped transport French war materiel to Chad and provided satellite intelligence on Libyan troop movements to the Chadian Army. But French aid was more critical to Habre's victory.

Habre's ragtag force of desert warriors dealt several crushing defeats in March to Libyan leader Muammar Gadhafi's forces, which had been occupying the northern third of Chad for 3 1/2 years. The Libyans abandoned about $500 million in Soviet-supplied military equipment as they fled back into Libya.

The Libyan Army, however, still occupies the 42,000-square-mile Aozou Strip just inside Chad, and Habre has been seeking French and U.S. backing to drive them out.

The senior U.S. official said Habre on Monday will discuss with senior Pentagon officials a U.S. request to obtain some of Chad's captured Soviet arms. These include at least one Mi24 Hind helicopter gunship, a variety of radars and SA6 and SA11 antiaircraft weapons.

The official said the Chadians first wanted to complete an inventory of the captured arms to determine what might be of use to them before deciding what they might turn over to the United States. But he said the two countries had "a very good, effective and cooperative relationship" on this issue.