Thank you so much for your reply. I have seen the user guide,and i have known i should use the long period to verification it .But i still have some questions:
1.what i want look is the year-to-year changes,so can i use the one year date to check it?
2.when i run the model in diffrent date with diffrent year,the result is so cross between year to year.Is this normal.
3.because the question 2,when one year result is checked accurately ,other year is so far from the real result . I was so confused about that.
THANK YOU AGAIN!!! hope you have a nice day.