How to start ICE?

I'am a beginner of Middleware, How to begin my ICE study?

I recommend to study the examples in the Ice manual, and further to have a look at the demos located in the demo subdirectory.

Thanks, I will not use ICE in game development, I wrote network application before, using protocol defined by me, when the application become complicated, programing is very difficult.
So I want to use ICE, is it a correct choice for me?

Without knowing exactly what your requirements are, it's difficult to say if Ice is the best solution for you. I suggest to read the manual, then you will have a better feeling for what Ice can do for you.