The Chinese will do anything they can to save face, so they consider it rude to say "no" directly. They often say something like "maybe," "I am busy," or even "yes" when they really mean "no," or convey a no answer in way that foreigners don't understand. This behavior sometimes causes confusion with Westerners who like a yes-or-no answer, and who tend to believe there is a possibility of a "yes" unless they are told "no" straight out. Chinese consider it rude, kind of mean and too direct to say "no."
It is also rude to cross your arms or legs, or have your hands in your pocket when you are speaking to someone.
Try to avoid staring at someone's eyes directly, which will make the Chinese uncomfortable.
Chinese also don't like it when Westerners point at people; wear strong colognes or perfumes; put their feet or sit on desks; don't use titles or show proper respect to elders and superiors; boast and offer their opinions to readily; want immediate answers; and show a lack of patience.