This paper analyses and discusses the cross polarization problem in frequency re - use communication system . a accurate calculating methed and improve way is gived . ii is useful for communication system engineers 摘要本文分析和讨论通信系统引入频率复用技术而带来的交叉极化问题。给出定量计算方法及改善的途径。对工程技术人员有很大的指导意义。