Post-apocalyptic fiction isn't so much a realistic analysis of human behavior as it is a projection of a culture's values and beliefs.
Take the "Walking Dead", for example. A central theme to that series (TV show or comics), is the existence of safe but tyrannical communities. It is contrasted with Rick's group, who are good decent folk, but are constantly struggling to survive.
There's also Stephen King's classic "The Stand". The "good guys" are disorganized but democratic. The "bad guys" are well-organized, but live in fear.
In Resident Evil (the movies), every form of civilization has collapsed, except the Umbrella Corp, who continue their nefarious experiments in vast underground complexes. This is an obvious reflection of the fear of a powerful corporation in a consumerist society. I'm not sure "evil mega-corp" has as much of a resonance to Chinese audiences.
Obviously, it would be entirely speculative to try to predict what people would really do in the event of an Extinction Level Incident. After all, nothing says "Walking Dead" is an accurate portrayal of post-apocalyptic Americans.
So the real question is, what would a Chinese writer, or a writer with a Chinese mindset, come up with for a post-apocalyptic world set in China?
Or rather, how would *YOU* create such a setting?
Well I think even describing such fiction as an entire culture's views are pretty sweeping. Culture plays a part, but any society, modern or historic, would be far too complex and diverse for any one view point or ideal to accurately and effectively encaptulate them. We can only say that each representation of those fictional universes as the individual writer's own interpretation of what people might do in such extremes viewed through the prism of his own unique mix of cultural, political and social influences and leanings.
It is true that broadly, cultural differences might play a part as that helps to shape and define how we each understand and interpret the world. Thus, if i may be so bold, I think the question you wanted to ask was not what a post-apocolitic China might look like, but rather how your typical Chinese writer might imagine what a post-apocolitic China might look like.
So, on the most general scale, your average western writer might be more instinctively distrusting of government and authority, and would be more predisposed to look favourably on individuality and be more understanding, if not tolerant of rebellious behaviour or other big individual character flaws and more appreciative of human frailty, as is well depicted in shows like the walking dead. Thus the story a western writer produces would almost invariably have well-run, highly authoritative communities either seem too good to be true and always harbour some dark secret, or as openly dictatorships with nazi-like Eugenics programmes and forced euthanasia of the weak or old etc, and that will always bring those communities crashing down while those who survive and thrive do so because of their liberty, freedom and individuality.
In a way, such shows and films are highly predictable and the message they hammer home are almost propaganda-esqu crude and astonishingly uniform given the supposed freedoms and individuality their writers are supposed to champion.
Similarly, I see a Chinese made walking dead as a similar mix of what your average Chinese person would have been taught to value since they were a child, and while the characters they create might be as diverse and individually flawed and have strong defining characters and individuality not at all dissimilar to the range of characters you might have in a western show, the 'world' the Chinese writer creates would be more inclined to look favourably on obedience and discipline and have stories and scenarios where a group's well being and survival depends on people surpressing their 'selfish' individual wants and fears and being able to follow orders. In a way, I would imagine a Chinese writer's take to be more optimistic and hopeful, where a selfish or disruptive character might overcome their 'base' instincts to perform a selfless act or actually follow instructions and save a day. So in a way, it would be more a story of self betterment and growth, provided the character lives long enough to actually learn from their selfless act, because let's face it, Chinese writers do love their heroic self sacrificing deaths, maybe a little too much.
Western writers tend to take the more pessimistic outlook, where characters are unable to change their core selves, or have their nobility and sense of principle gradually eroded and worn down by the harshness of the world they find themselves in. Western writers do love their 'realism' and tragedies, maybe a little too much as well.
Just like how the walking dead 'punished' Andrea for falling for the Governor's fake ideal society as a warning for the audience of the 'dangers' of not being sceptical of promises made by authority, I can easily picture the reverse in a Chinese walking dead, where someone's distrust of authority and rebellious behaviour in not following orders gets people and/or themselves killed as a warning for the audience not to let distrust and individual selfishness harm the good of the group/community as a whole.
To drag myself back to some kind of point, in summery, I think that a post-apocolitic China will look very much like a post-apocolitic anywhere no matter who writes the story. The range of characters will also be largely similar, encompassing most of the range of common human character sets. The key difference will be what kinds of challenges the 'environment' throws at our group of characters, and what actions and behaviour the author favours. This will, in a way, work like natural selection, where those characters who represents characteristics the author thinks are negative either gets killed off because of those character flaws, converted to the 'one true path', whatever that may be, or ends up as the weak link that breaks and hurts themselves and others or becomes the villain of the piece alongside your more typical cookie cutter bandit bad guys.
