An experimental model of the improved rocket has already been assembled, and would be sent to a satellite launch center for training missions to test its accuracy, reliability and safety capabilities.
In September 2008, China launched its third manned spacecraft Shenzhou-7, following Shenzhou-5 in 2003 and Shenzhou-6 in 2005.
Taikonaut Zhai Zhigang performed the country's maiden space walk during the mission.
Meanwhile, China is building a carrier rocket production base in the northern municipality of Tianjin, according to Liang.
With a total investment of 10 billion yuan and covering an area of more than one million square meters, the base would be capable of producing 12 carrier rockets each year once completed, he said.
The base will be able to produce two carrier rockets each year after the first stage of construction is completed next year.
Liang said experts are currently developing China's new generation of carrier rockets, the Long March V, in the Tianjin base, adding that research on the initial model of the large-thrust rocket is already underway.
Earlier report said Long March V, with a maximum payload capacity of up to 25 tonnes, would be put into service in 2014.
"The Long March V should satisfy China's need in its space technology development and the peaceful use of space resources in the coming 30 to 50 years, ... and would meet both domestic and overseas market demands for satellite launches before 2030," Liang said.
