Astronauts have been playing a more and more import ant role in the whole manned spacecraft system while their operation errors research is being paid more and more attention.

It is very important to find design defects and to improve the system reliability when digital human models based on anthropometric data are applied in simulation of manned spacecraft design scheme.

Finally, some Suggestions were proposed on space man-machine system development according to recent ergonomic trend in space ergonomics and the basis of experience of first manned spacecraft project.