'FTP_R3_TO_SERVER' Chinese Character display as u2018#u2019

I want to upload a *.txt which was saved as unicode .

I use the following code to upload file to FTP server:

call function 'FTP_R3_TO_SERVER'

exporting

handle = p_handle

fname = p_filename

character_mode = 'X'

tables

text = i_file

exceptions

tcpip_error = 1

command_error = 2

data_error = 3

others = 4.

But after upload, I find all Chinese Character display as u2018#u2019.

By the way, I use ECC6.0 to do development.

How can I let the Chinese display correctly?