本文研究了经典信息在量子信道传输所需要的条件和限制。结果证明,当表征经典信息的量子状态由纯态构成时,经典信息可以在量子信道传递。发送和接收端的信息受Helovo边界值的限制,该值为每符号的平均量子信息量;当纯态之间正交时,该值可以最大化至源信息的熵。 This paper studies the conditions and limitations of classical information transmission in quantum channel. The results show that when the quantum state characterizing classical information is composed of pure states, the classical information can be transmitted in quantum channel. The information at the sending and receiving ends is limited by the Helovo boundary value, which is the average amount of quantum information per symbol; this value can be maximized to the entropy of the source information when the orthogonality is orthogonal.