The Reagan administration's policies took some harsh blows from the Trilateral Commission at its meeting in Rome last week. Although the commission has no official decisionmaking status, the clout of its members - political leaders, bankers, businessmen, and academics from Europe , Japan, and North America - makes its recommendations hard to ignore. In the past they have prefigured official policy.
The commission's findings will be submitted to the governments participating in next month's summit conference in Williamsburg, Va., said European chairman Georges Berthoin of France.
Highlights of the meeting include:
* World economy: This was the central topic of discussion. US Federal Reserve Board chairman Paul Volcker reportedly indicated a willingness to be more flexible about limited but direct US intervention to stabilize the dollar's fluctuations on foreign exchanges. Until now the Reagan administration has adamantly refused to intervene in the foreign exchange markets.
According to former Chase Manhattan Bank chairman David Rockefeller, ''Different people in the meeting were of the opinion that the dollar was on the high side in terms of bringing about a balance of trade.''
''There is a feeling that the end of the recession and renewed growth would solve the most important economic problems facing the world today,'' he added.
There was a general consensus, too, that military security is intimately linked to economic security. Significantly, the Japanese participants exhibited increasing awareness of this relationship, several members said.
* Western defense: A paper presented to the commission recommended a ceiling on strategic warheads instead of rockets as in earlier SALT proposals.
''Such an agreement would leave the United States free, within the ceiling, to deploy weapons systems such as sea-launched missiles and a new single-warhead intercon-tinental ballistic missile which would help it move away from present theoretical vulnerability of US land-based strategic forces, which may weaken deterrence and cause instability in crisis and war,'' the report said.
It also stressed the need for France to play a large role in the defense of Europe, for the continued presence of US troops in Western Europe, and for the creation of nuclear-free zones in Africa and the Middle East as part of a renewed nuclear nonproliferation effort.
Another report said Japan would have to raise the 1 percent of gross national product ceiling on military spending. It also suggested the United States and Britain reinstitute the draft to build up the West's conventional forces.
* US missiles: Former US Secretary of State Henry Kissinger said the present position of the Reagan administration is ''adequate and correct.''
Zbigniew Brzezinski, national security advisor to former President Carter, predicted that should the US buckle under the Soviet political pressure to postpone deployment of the 572 cruise and Pershing II missiles in Europe, ''There would be no arms control agree-ment.''
* Help for the developing world: ''There will not be satisfactory recovery in the economies of the OPEC countries until the developing countries move forward, '' said former World Bank president Robert McNamara. But, he stated in his report to the commission, ''Even in face of the world recession, there is much they can do to advance economically.''