In mobile cellular systems, the ever-increasing demand for service continuously necessitaties cell splitting or assignning additional channels to certain base stations. But for most of the presently operative systems, the channels that are already used at some existing base stations are strongly desired not to be changed, giving rise to the Problem of Adaptively Assigning Channels(PAAC). In this paper, we show that the problem can efficiently be solved using the neural network algorithm by exploiting the special feature of the PAAC.