1)将信源消息符号按其出现的概率大小依次排列：。

(2)将依次排列的信源符号按概率值分为两大组，使两个组的概率之和近似相同，并对各组赋予一个二进制码元“0”和“1”。

(3)将每一大组的信源符号再分为两组，使划分后的两个组的概率之和近似相同，并对各组赋予一个二进制符号“0”和“1”。

(4)如此重复，直至每个组只剩下一个信源符号为止。

(5)信源符号所对应的码字即为费诺码。-1) The source message symbols are arranged in the order in which they appear.

(2) The order of the source symbols is divided into two groups according to the probability value, so that the sum of the probability of the two groups is approximately the same, and each group is given a binary symbol　0　and　1 .

(3) The signal symbols of each group are subdivided into two groups, so that the sum of the probabilities of the two groups is approximately the same, and each group is given a binary symbol　0　and　1 .

(4) is repeated until there is only one source symbol in each group.

(5) The source code corresponds to the codeword.