Abstract: This paper analyses the basic functions and structures of the Xenix Kernel,and it is shown that the expansion and modification of the C-Xenix Kernel can be performed.The tasks include:expansion of the kernel space,association of the character input/output routines with the Chinese dictionary,character library and these handling routines,delay handling,parity check and ambiguity processing for Chinese character internal codes,automatically swapping of the Chinese character dictionary and scheduling of the second level Chinese character library,etc.Finally,some viewpoints about the kernel modification are presented.