Five years ago I got my pocket knife confiscated at railway station of Harbin city, the police told me there was a blade length limit of 7 cm. Airport is another story, absolutely zero tolerance. They once took my gillette (spell?)safety razor head, of cause that was immediately after a hijack incident. Basically local policeman has the right to interprete if your knife is legal or not.
In China, other than kitchen knives, knife-making hasn't been industrialized yet. All because of the strict law regarding weapons. I don't know any individual makers. Factories who do make knives are under the name of artistic or tourism's or martial art practicing's name, and you can expect the quality from there.
China does have some exellent craftsmen, and suffient steel materials as well. Paul Chen's factory in Dalian is a good testomeny (spell again?). But because of the law, Paul Chen's products can only be used for export and can not be sold domestically.
Yes, only in some remote provinces where the so-called minority nationalities live, knife law is a bit loose because of the local people's traditional life style. But even in those areas, most of the stuffs you can see on the market are worthless tourist's stuffs.
I have been having a deep sorrow in my heart for China's current situation regarding knives for a long, long time. China is one of the most ancient countries with splended knife and sword making history. But the traditional knife and sword making arts probably have been lost... No one so far has standed out to persuade the goverment to at least do something to preserve the art.
Sheng