In China, December 25 is a regular working day,  For Chinese New Lunar Year, you will get from one week to 4 weeks, depending where you work.  If you are a teacher, from two to  three weeks.  Some Government  employees get as much as one month off

i have to take holiday for christmas.

western new year is as far as i know also 1 day holiday in china but not sure

Chinese employer, local contract, therefore local holidays... No Christmas, and no extra days for New Year. But I got more-than-average holidays for Spring Festival & Autumn Festival, totaling to 4 weeks a year. It depends on how you negotiate with your boss.

I've worked for private and government schools. I've always had 2 days off for Christmas, we foreigners are usually given that as it is 'our holiday' so to speak. New year January 1st is a national holiday, I'm pretty sure. Three days off for that. Regarding Chinese New Year.. most private schools will only give you about a week off.. In the government schools, I got 6 weeks off.

http://www.timeanddate.com/calendar/?year=2014&country=41

  I work privately so I get about three dead weeks at Spring Festival and something like the same in Summer. From this year on I intend to use that time to visit my friends and family back on Mars.