1. A computer input system comprising: a storage unit storing a pre-determined symbol permutation order and four carry radices, wherein the four carry radices have one-to-one correspondences to an amount of initial consonants, an amount of head vowels, an amount of vowels and an amount of tones of a phonetic notation symbol, and each of the four carry radices is a positive integer; a representative number obtaining module obtaining four symbol representative numbers of a Chinese character according to a Chinese character phonetic notation; and a coding module coupled to the storage unit and the representative number obtaining module and generating a Chinese character coding number of the Chinese character by applying a mathematical operation on the symbol permutation order, the four carry radices and the four symbol representative numbers.
2. The computer input system according to claim 1 , wherein the four carry radices are the amount of the initial consonants plus one, the amount of the head vowels plus one, the amount of the vowels plus one and the amount of the tones, respectively.