Leaks of a secret report accusing Turkish forces of commiting atrocities on Cyprus and expelling Greek Cypriots from their homes during and after the invasion here in 1974 are building pressure on the influential Council of Europe to condemn Turkey.

A West European condemnation of Turkey could be a major obstacle to any renewed U.S. arms pacts with Ankara. The Carter administration, which appears more sympathetic than its predecessor to the congressional arms embargo against Turkey over the Cyprus to a just-negotiated $500 million sale to Turkey of 40 F-4 Phantom jets.

The new administration has indicated that in general U.S. aid is likely henceforth to be tied more closely to respect for human rights by recipient governments.

The findings of the report by the European Commission of Human Rights will be rejected by Turkey. Turkish Cypriot Bayrak Radio said here yeaterday. But senior Greek Cypriot sources in President Makarios government said today that they expect the report to be adopted by the Council of Europe next month.

The controversial report which diplomats have shown reporters in several European cities, accuses Turkey of massive violations of six articles of the European Convention on Human Rights.

Prepared by a 20-member delegation headed by a British lawyer James Fawcett, the report is based entirely on interviews with Greek Cypriot refugees since the Turkish authorities refused to allow commission members access to northern Cyprus or to cooperate with the inquiry.

Diplomats and reporters here who have had limited freedom to visit the Turkish-controlled part of the island have found evidence supporting allegations in the report.

The report accuses Turkish troops of killing innocent civilians, rape, savage mistreatment of civilians including children and of extensive looting of Turkish occupied Greek Cypriot villages.

Turkey will withdraw 1,000 more soldiers from Cyprus on Tuesday, the Associated Press reported from Ankara. Turkey, quoting an authoritative source. Officials said the Turkish force remaining on the island would number 28,000.

The commission report also concluded that Turkey has "presumed responsibility" in connection with 2,000 missing Greek Cypriots whose fate is an emotional issue among the 500,000 Greek Cypriot population.

The politically most damaging part of the report's findings is the Turkish forces' expulsion of Greek Cypriot refugees from their homes in the Turkish-controlled northern third of the island and their refusal to let them return.

This breach of the convention constitutes a "continuing violation" that can be terminated only by the refugees' return - something Turkish authorities refuse because it contravenes their demand for either a "Turkish" zone in northern Cyprus or an overall Cyprus settlement and the withdrawal of the Cyprus government's complaint to the Council of Europe.

A related violation is the takeover of Greek Cypriot lands, homes and businesses and their distribution to Turkish Cypriots in northern Cyprus.

The forced expulsion of Greek Cypriots continues. Most of the 20,000 who remained in the Turkish zone after Turkey's 1974 invasion have been gradually expelled by intimidation and other pressure tactics. Fewer that 2,000 remain, and they are being driven south across the line at the rate of 50 a day.

Recently diplomatic visitors to part of the Turkish Cypriot zone report that antiquities and property are now being better protected.But international observes are still barred from inspecting the sites in the north.

The Turkish Cypriot radio challenged the report for ignoring the wrongs suffered by Turkish Cypriots in the fifteen years of independence here before the pro-Athens coup in 1974 and the subsequent Turkish invasion.