Premier Vo Van Kiet of Vietnam will make the first visit ever to Japan by a Vietnamese head of government for four days beginning Wednesday. His aim: to secure future Japanese aid and foreign investment. He also will get an offer from Japan to help the Hanoi government draft economic laws designed to induce foreign investment and provide a framework for a market economy.

Last November, Japan took a step ahead of the United States in normalizing relations with Vietnam by approving $396 million in loans, ending an aid suspension it had imposed in 1979 when Vietnamese troops invaded Cambodia.