Taxi drivers have also been instructed to remove handles from rear windows and not to let passengers open doors or windows as they pass important venues to stop subversive leaflets being scattered on the streets.
The precautions are part of Beijing's attempt to preserve an image of harmony as President Hu Jintao prepares to transfer power as party leader to anointed successor Vice President Xi Jinping next Thursday.
Li Zhonghe, 65, a retired construction worker, says he is unsure how keeping his 40 to 50 pigeons in their coops when the congress starts will help this happen.
"It's this way every time there is a congress," he says.
"I'm accustomed to it by now."
Pigeons, often raised as a hobby in China, have been used as a tool of subversion before.
In the late 1990s, dissidents released pigeons carrying slogans written on ribbons tied to the birds' feet in southern China.
The Beijing Carrier Pigeon Association said in an online notice two annual autumn races, originally scheduled during the congress, would be postponed until December. It did not say why.
The five-yearly Congress is a magnet for thousands of petitioners from provinces across the nation who see the meeting as a rare chance for them to seek redress for their grievances.
Local media reports say more than 1.4 million people have fanned out across Beijing to boost security.
Residents have complained of snail-paced Internet speeds as censors comb though sites to remove subversive content.
Beijing police have also banned residents from flying remote control model aircraft.
Authorities have also banned the words "death", "die" or "down" from songs on television.
Music composer Gao Xiaosong wrote on his microblog the words were deemed "unlucky".
Hu Jia, a dissident who was made to leave Beijing ahead of the congress, says the measures taken this time were the most excessive he had seen.
"Don't you think this is absurd?" he told Reuters by telephone from his father's hometown in central Anhui province.
"They've reached a new level of psychosis."
Chinese Internet users have gone on microblogs to discuss the "smothering" security.
One compared it to "1984", the George Orwell novel that described life under a government that put its people under pervasive surveillance.
"In the face of these absurdities, we are powerless," a microblogger wrote.
"It's a reminder that no matter how ridiculous and comical, this is an era that we can't laugh in."
At least 130 people have been detained or placed under restrictions since September, according to U.K.-based rights group Amnesty International, a tactic often used ahead of important political events.
Beijing-based rights activist Liu Shasha said she was forced back to her hometown in the central Henan province on Oct. 22.
"At first they were very nice but then as soon as I got in a car with them they put a black hood over my head," she says.
"When I tried lifting it up to breathe better they kept forcing it back down, until they eventually tied my hands behind my back. I'm really angry."
Another dissident forced to leave Beijing is Woeser, a prominent Tibetan writer who was told to leave in August.
"They said I can come back once the congress is over, so I suppose at the end of the month," she said.