Please be more specific. You should at the very least type out some details beyond just having a general question as the post title and nothing else having been written.

Do you mean Republican China immediately before the civil war and the Communist victory? Do you mean the founding of China after the fall of the last dynasty? Do you mean the events that brought about the end of the last dynasty?

As per the subreddit rules:

People asking questions should make every effort to ensure that their questions are clear, specific, and novel.

Your question is covering a time potentially as long as three centuries and potentially as short as three years.

If you're not spending at least 10-15 minutes on Wikipedia trying to answer your question before posting here, then it's probably too vague for anyone to give a reasonable answer about a time period as complex and nuanced as that leading up to 1949.