Why chinese character can't inputed in console with root user?

[luofeiyu]

My os:debian8+lxde0.2
chinese input method is: fcitx
The locale output is same for both root and normal user.

LANG=en_US.UTF-8
LANGUAGE=
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

Chinese character can be inputed when to enter console with normal user.

I wonder why chinese character can not be inputed when to enter console with root user.
When to enter into console with root user, the fcitx can't opened to work.