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Thanks very much Johannes_B~! You rely me so many times!
And Stefan_K, your code works well~ Thanks a lot!

Sure.
This is the whole sample file and I add one nomenclature entry and print it at the beginning of the doc.
The main doc is dis.tex
Thanks very much for your time and sorry for the trouble I made

I attaches the compiled file here.
Clearly the nomenclature title itself is not following the format. But the contents do follow the format.

Hello, thanks so much for the quick reply.
I am currently using the package nomencl and I read the document and have no idea how to change the format.
I am new to Latex but I have to use latex for thesis.
I have a latex template which is very complicated to me to read and there is no nomenclature ...

I am writing my thesis and trying to change the nomenclature title itself to center and a smaller font to match the format of the rest of the thesis.
Thanks a lot