All three Chinese taikonauts have entered the Shenzhou-7 spacecraft at 18:28 p.m. Thursday, about three hours ahead of its scheduled launch.
They then plugged their spacesuits to the re-entry module of the craft and checked the communication system with the ground control after reviewing the operation manual of the spaceship.
The Shenzhou-7 will blast off from Jiuquan Satellite Launch Center in northwest China later Thursday. The launch window was set between 9:07 p.m. to 10:27 p.m (1307 GMT to 1427 GMT).
Chinese President Hu Jintao met the trio taikonauts before they entered the spacecraft.
Hu wished the trio taikonauts a complete success in the mission during the brief meeting.
"With strong support of the whole nation, thorough preparations of various sectors, rigorous training and sophisticated skills of yourselves, I believe you will have a complete success in this glorious and sacred mission," Hu said.
"The motherland and people are waiting for your triumphant return," he said.