在信道错误概率都为 =0.5的BEC中:当码长N=28逐渐增加到码长N=211时，信道容量I（WN(i)）趋向于0和信道容量I（WN(i)）趋向于1的点数越来越多,也越来越明显了。这说明了，当码长N不断增大时，这种往两边信道聚集的现象越来越突出,到了最后对于信道中的容量,将会有一部分信道的容量向值为“1”的信道中逐渐聚集，概率约为 ；而另外的一部分信道容量向值为“0”的信道中逐渐聚集，概率约则为 ，这就是我们所说的信道极化现象(In the BEC of the channel error probability is =0.5: when the code length N=28 is gradually increased to the code length N=211, the channel capacity I (WN (I)) tends to 0 and the channel capacity I (WN (I)) more and more points to 1, and more and more obvious. This shows that, when the code length N is increasing, the phenomenon of gathering on both sides of the channel becomes more and more prominent. At the end of the capacity of the channel, some channel capacity will gradually gather in the channel with the value of "1", the probability is about, and the other part of the channel capacity is gradually gathered in the channel with the value of "0". The probability is about that, which is what we call channel polarization.)