BANGKOK, OCT. 22 -- Burmese troops raided 133 monasteries today after Buddhist monks, who have been at the forefront of opposition to the country's military rulers, persisted in their refusal to minister to the religious needs of soldiers.

Yangon Radio, the broadcasting station of the ruling State Law and Order Restoration Council of Myanmar, formerly Burma, said the raids in the Mandalay area had uncovered illegal papers, flags and National League for Democracy badges. The league won an overwhelming victory over a military party in parliamentary elections in May, but the army has so far denied it any role in government.

The raids followed a claim by the council that the militant monks of Mandalay had given up their boycott of soldiers and would once again accept alms from them and give their blessings to military families.

Buddhist monks in Mandalay and other Burmese cities began a boycott of the army on Sept. 6, nearly one month after soldiers put down a democracy demonstration there.

Since the middle of last week, top generals of the government have met senior monks and broadcast toughly worded demands for an end to the boycott. Soldiers with drawn bayonets surrounded monastery complexes Sunday after the ruling generals declared Buddhist groups taking part in the boycott illegal.

The ruling council said Sunday that senior monks had signed pledges to end the boycott, but Yangon-based diplomats said many younger monks, especially in Mandalay would carry on. Mandalay, Myanmar's second-largest city, was the center of anti-government activity during a 1988 democracy campaign that the government suppressed, killing thousands.

Analysts of political affairs in deeply Buddhist Myanmar say the boycott has created a serious problem for the military government, which has held power for more than a quarter-century. The nation's monks are closely associated with the nation's democracy movement.

"Of 300,000 monks in {Myanmar}, I reckon 50,000 are opposing the government," one Yangon observer said today.