Wang Yongzhi, chief designer of China's manned space flight program, speaks to a reporter at the Beijing Aerospace Command and Control Center in Beijing today.

Chief designer of China's manned space program Wang Yongzhi said here Monday morning the successful flight of the nation's second manned spacecraft indicated Chinese scientists have mastered the technology for multi-person, multi-day space mission.

This is of "great importance" to the country's manned space program in the next step, Wang said after the safe landing of the re-entry capsule of the craft, which was launched Wednesday morning.