In a statement dated March 31, the State Administration for Radio, Film & Television said that TV dramas that involve characters traveling back in time “lack positive thoughts and meaning.” The guidelines discouraging this type of show said that some “casually make up myths, have monstrous and weird plots, use absurd tactics, and even promote feudalism, superstition, fatalism and reincarnation.”

http://artsbeat.blogs.nytimes.com/2011/04/12/making-tv-safer-chinese-censors-crack-down-on-time-travel/