The movie was originally scheduled to open across Asia on Wednesday.
Officials suggest the film's depiction of a major crime that the Chinese government doesn't know about could show the security services in a poor light.
M:I 3 spent more than a month filming in China and its final action sequence is set in Shanghai.
The delays are a harsh blow for the film, which allowed the Chinese government to be extensively involved while the movie was in production.
The earliest the film would be released is mid-July.
Industry sources claim the 10-week delay could cost 30-40 percent of the movie's box-office take in mainland China, because pirated copies of the film would be readily available by that time.
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