Why my font setting changes?

[Water Lin]

I need to open some Emacs windows for better editing performances. One
for normal text editing and the other for ECB coding.

But I don't know why my Emacs font changes when I use command
M-x new-frame to open a new Emacs frame.

I just don't like the font Emacs using for my new frame. How can I set
this?

Thanks

Water Lin

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Email: WaterLin@ymail.com