President-elect Ronald Reagan's foreign policy advisers are decidedly displeased by a barrage of stories implying in one way or another that two travelling Republicans are acting as unofficial representatives of the incoming administration.

Former secretary of state Henry A. Kissinger, who is touring the Middle East and Africa, and Anna Chennault, a former bitter foe of the Chinese communists who now is visiting China, have been making statements that sound like attempts to influence U.S. policy, or have been read by foreign officials as early soundings of U.S. policy under Reagan.

Similar problems shortly after the election, involving some officials who were working with the transition effort, prompted Richard V. Allen, Reagan's top foreign policy adviser, to issue a memo warning against making any comments in meetings with foreign officials that could be construed as heralding administration policy.

Both Kissinger and Chennault are on private trips, says Allen, who is Reagan's choice to be national security affairs adviser. Allen, who worked for Kissinger briefly at the start of the Nixon administation and is not on the best of personal terms with the former secretary of state, told reporters that Kissinger "only speaks for himself."

Kissinger, who has said he would be willing to serve for a limited time as Reagan's Middle East peace negotiator, is traveling with CBS chairman William Paley and New York philanthropist Brooke Astor.

Chennault, the widow of Gen. Claire Chennault, who commanded the Flying Tigers in China during World War II, is travelling with Sen. Ted Stevens (R-Alaska). She has actively supported recognizing Taiwan as the valid government of China. Just 15 months ago, she denounced the U.S. decision to normalize relations with Peking.

Regan advisers make it clear that they do not need Chennault's aid in forming their policy toward China. Reagan himself has long been sympathetic toward Taiwan, but recovered from campaign gaffes to make clear that he had no intention of undoing the formal ties that exist between Washington and Peking and that he seeks a good relationship with China.