There is no doubt that this is a challenging problem; however, I cannot imagine China outlawing female immigration anytime soon... First, because it wouldn't be that effective, unless they also passed a national law outlawing marriage to a foreign national. The problem of a low number of women also helps China with it's original intent of the so-called "one-child" policy. Finally, they must significantly curb the number of women on foreign education visas if they want to plug the holes. These would be some very difficult measures to pass in a society that is becoming increasingly "democratic". The more disturbing thought (to the patriotic side me) is the increasing number of Chinese nationals who are moving back to China. I used to work for a very large and successful technology company... of course, we employed quite a few Chinese software engineers. It was a little disturbing to see the number of our Chinese engineers (including the most successful ones) moving back to China. I got the sense that life in the US is simply not as attractive to them anymore; and couple this with China's booming economy, you get the reverse immigration issue.