how to keeep happy in the daily life and work

denglihai, I believe that a lot of it here is basically mental and if your mentality isn't there then you would not have a positive attitude. It is a 2 way street and when you let things get you down then you will be down. I like these words by Charles R. Swindoll which really says it all here and I hope you will pick up a thing or two here where he said: “The longer I live, the more I realize the impact of attitude on life. Attitude, to me, is more important than facts. It is more important than the past, the education, the money, than circumstances, than failure, than successes, than what other people think or say or do. It is more important than appearance, giftedness or skill. It will make or break a company... a church... a home. The remarkable thing is we have a choice everyday regarding the attitude we will embrace for that day. We cannot change our past... we cannot change the fact that people will act in a certain way. We cannot change the inevitable. The only thing we can do is play on the one string we have, and that is our attitude. I am convinced that life is 10% what happens to me and 90% of how I react to it. And so it is with you... we are in charge of our Attitudes.” Take care and have a nice day ahead.