Anti-nuclear demonstrators, jubilant after a huge rally drew hundreds of thousands of protesters to Central Park here Saturday, now plan to switch to civil disobedience with plans to block the U.N. missions here of the five major nuclear powers.

Organizers said today they expect about 1,000 volunteers to join in a five-pronged protest Monday, sitting in and lying down to block the entrances of the U.S., Soviet, French, Chinese and British missions.

Police have prepared two special booking centers and cleared all available jail space in the city in readiness for the protest, which is intended to be peaceful.

"We'll just go limp and be carried off," said one organizer, Margaret Bergamini, of the June 14 Civil Disobedience Campaign, a coalition coordinating Monday's protest. "We will not resist arrest, but neither will we cooperate," she said.

Meanwhile, police and city officials praised the people who marched in Saturday's demonstration--one of the nation's biggest rallies--for their neatness and orderliness.

"Perfect is not quite adequate to describe the whole thing," Parks Commissioner Gordon Davis said after surveying Central Park today.

The march, which police said drew 550,000 to the park and as many as 250,000 more to other events leading up to it, resulted in only one reported arrest, for petty larceny when a woman's bag was taken.

Capt. Richard Kunze of the city's emergency medical service said 71 persons were treated at the rally scene for a variety of minor ailments such as cuts, scratches and twisted ankles. Forty-four people were taken to hospitals, most of them for cuts or possible fractures.

One woman went into labor, a man was attacked by a horse and another man was mugged, Kunze said.

William Fitzpatrick, commander of the Manhattan patrol borough, said it wasn't the kind of rally he wanted to see every weekend. But, after coordinating efforts of 6,000 officers, the largest number of officers assigned to patrol one event in the city, Fitzpatrick was confident he could do it again.

"Maybe once a year," he said.

Parks Commissioner Davis, praising the marchers as an "extraordinarily decent gathering of all kinds of people from all over the country," said 1,000 workers had been scheduled to clean up but many were sent home early.

The marchers left most of their 60 tons of garbage in front of the United Nations, and Davis said the park "is cleaner than my front room. It's remarkable--750,000 people were here and you wouldn't believe it."

He said the demonstrators "must have put the garbage in their knapsacks and taken it back to Topeka, San Francisco, Bay Ridge and Hoboken or wherever."