File photo: Tiangong space station Photograph:( AFP )
The trio blasted off on a Long March-2F rocket from the Jiuquan launch centre in the Gobi desert. They will spend three months on the space station.
The first astronauts arrived at China's new space station on Thursday in the country's longest crewed mission to date, a landmark step in establishing Beijing as a major space power.
The trio blasted off on a Long March-2F rocket from the Jiuquan launch centre in northwest China's Gobi desert, and their craft docked at the Tiangong station around seven hours later, where they will spend the next three months.
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State broadcaster CCTV showed a live feed from inside the spacecraft during the journey, with the three astronauts lifting their helmet visors after it reached orbit as one smiled and waved at the camera.
Another floated a pen just off his lap in zero-gravity as he browsed the flight manual.
Watch: China launches three-man crew to new space station
Around seven hours after lift-off, space officials confirmed that the craft had docked with Tianhe, the core module of the country's new space station.
The Shenzhou-12 craft has "successfully docked with the forward port of the core module" of the Tiangong station, said the China Manned Space Agency, as state TV showed live footage.
At a ceremony before blast-off, the three astronauts, already wearing their spacesuits, greeted a crowd of supporters and space workers, who sang the patriotic song "Without the Chinese Communist Party, there would be no new China".
The mission's commander is Nie Haisheng, a decorated air force pilot in the People's Liberation Army who has already participated in two space missions.
The two other members are also members of the military.
The Tianhe module of the space station has separate living spaces for each of the astronauts, a "space treadmill" and bike for exercise, and a communication centre for emails and video calls with ground control.
It is China's first crewed mission in nearly five years.
Huang Weifen of the China Manned Space Program said the astronauts will perform two spacewalks during the mission, both lasting around six or seven hours.
She also said the trio will wear newly-developed spacewalk suits.
The launch represents a matter of huge prestige in China, as Beijing prepares to mark the 100th anniversary of the ruling Communist Party on July 1 with a massive propaganda campaign.
To prepare for the mission, the crew underwent more than 6,000 hours of training, including hundreds of underwater somersaults in full space gear.
The Chinese space agency is planning a total of 11 launches through to the end of next year, including three more manned missions that will deliver two lab modules to expand the 70-tonne station, along with supplies and crew members.
China's space ambitions have been fuelled in part by a US ban on its astronauts on the International Space Station, a collaboration between the United States, Russia, Canada, Europe and Japan.
It is due for retirement after 2024, even though NASA has said it could potentially remain functional beyond 2028.
Tiangong will be much smaller than the ISS and is expected to have a lifespan of at least 10 years.
China has said it would be open to international collaboration on its space station although it has yet to give specific details.
Zhou Jianping, the chief designer for the space programme, said "foreign astronauts are certainly going to enter the Chinese space station one day".
"There are a number of countries that have expressed a desire to do that and we will be open to that in future," he said.