Because their English is more better and thoughtful. Your question is perhaps not complete?

Because native English speakers tend not to say things like "Why does the schools in China prefers..."

Because if they hire someone like you... they gets a few awesome grammars! 

Because, it's the Law of the Land

Because schools react to what parents want and most parents believe foreigners are automatically good teachers. Not true of course, some are some aren't. No-one here thinks that teaching is a profession that you have to train for, they just think you stand up there and do it. Also most of the Chinese teachers of English cannot speak the language properly, they are full of the usual little mistakes. If you are a teacher you are the perfect example of why Chinese are generally useless at being English teachers.

No why.

You answered your own question. 

"

Why does the schools in China prefers teachers from English speaking countries ?"

Because these are not real schools, they are merely dating centers between foreign men and Chinese women, or entertainment centers for kids.

International schools (and I mean real international schools, not schools owned by Chinese that claims to be international but follow outdated curriculums and have no foreign students) will never want "native speakers only", instead they will setup interviews during which they can evaluate the English proficiency of the candidates, then demo classes of course.

they just does.... that's all.

Don't be disoppointed if you are not having 'white face'. Plastic surgery is cheap nowadays. Put on your white face and get in the game to have your pennies. Just don't give a shit to those pointing your grammar mistakes for no FT here teache grammar rather spoken English. The local teachers teach grammar more effectively than any other scholar in the field. 

There were many good answers but in case they went over your head (in case you didn't understand the sarcasm), chintapalli, you did not write your question in correct English. No educated adult native English speaker would make those errors. Instead of: "Why does the schools in China prefers teachers from English speaking countries ?" it should be "Why do schools in China prefer teachers from English speaking countries?" Punctuation is always a dead giveaway that a writer isn't a native English person too. Commas (,), periods (.), question marks (?) and exclamation points (!) are placed after a word, not in front of, and there's no space between the word and the punctuation. Understand? This is why good schools prefer teachers from English speaking countries. But just as it's possible for the Chinese students to learn pronunciation and grammar like a native English speaker, it's possible for people like you. People do it all the time, but it seems like it's mostly the ones with poor English that want to come teach here! Lucky for the students, more schools these days are wising up to those scammers. Jayou!

Firstly, the angle of question is correct but the way it has been put forth is wrong , question is grammatically wrong ans I would like to agree on this part with "mldardar."

Anyway, this question is multidimensional and can be answered in many different ways but I would like to keep it simple and short.

1)In China, FT's are either not supposed to teach the grammar or they are not given ample time to teach this.

2)Secondly , there is phenomena of White Monkey(I'm not being racist over here but still sorry for offending anyone),many a times I have seen caucasians and central asians teaching English not only in kindergartens but also in training centres with their most weird accent I have ever heard.

It's not that people from Native countries are having cakewalk in job, we do but if employer wants appearance then a portion of foreigners are neglected.

So, in nutshell my advice for those foreigners who are either from native speaking countries or from non-native speaking but good English levels like India and as such are victims of racism should not lose hope and should apply to trainin centre like NDI,WEB,NEw ORIENTAL and couple of other as they pay attention to merits and not looks.

Firstly, the angle of question is correct but the way it has been put forth is wrong , question is grammatically wrong ans I would like to agree on this part with "mldardar."

Anyway, this question is multidimensional and can be answered in many different ways but I would like to keep it simple and short.

1)In China, FT's are either not supposed to teach the grammar or they are not given ample time to teach this.

2)Secondly , there is phenomena of White Monkey(I'm not being racist over here but still sorry for offending anyone),many a times I have seen caucasians and central asians teaching English not only in kindergartens but also in training centres with their most weird accent I have ever heard.

It's not that people from Native countries are having cakewalk in job, we do but if employer wants appearance then a portion of foreigners are neglected.

So, in nutshell my advice for those foreigners who are either from native speaking countries or from non-native speaking but good English levels like India and as such are victims of racism should not lose hope and should apply to trainin centre like NDI,WEB,NEw ORIENTAL and couple of other as they pay attention to merits and not looks.

They typically know when to use "does" and when to use "do".

why does u ask this question lmao