Satellite IP switches is a key technology in satellite IP network. Based on ICMP protocol,the error message of IP packet and the connectivity of different nodes can be tested. Therefore,the realization of ICMP protocol is very important in satellite IP network. According to the characteristics of modular design and weak processing ability of satellite, a new method of FPGA based on ICMP protocol is proposed,which can separate the ICMP judge from encapsulation flow. In this protocol,the ICMP judge flow is realized in every port processing module,and the ICMP encapsulation flow is accomplished by only one module, which can not only optimize the ICMP protocol processing flow,but also reduce the amount of memori-zers and processing resources of satellite.%卫星IP交换技术是实现星上IP网络的关键技术，在卫星IP交换系统中，通过ICMP协议可报告差错报文信息，并可对卫星IP网络中的不同节点进行连通性测试，因此ICMP协议在卫星IP交换系统中起着重要作用。针对星上模块化设计及处理能力有限的特点，提出一种星上ICMP协议的FPGA实现方法，将ICMP报文的判断和生成流程分开，判断部分可在各个端口处理模块完成，生成部分采用单独模块完成，不需要在每个端口模块都完成ICMP报文生成处理操作，不仅优化了星上ICMP协议处理流程，并且节约了星上存储及处理资源。
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