According to ITU-T protocol stacks for signaling lacks necessary call /control functions ,a new universal satel-lite signalling model is proposed in this paper .The software design shows the signalling model can remedy the part in stand-ard protocol.The Q.2931 protocol,which is the standard protocol for ground networks ,is realized difficultly in satellite switc-hing system due to high bit error ratio and high-latency.This paper also proposes a simplified Q .2931_s protocol aiming at this problem .%文章针对ITU-T所定义ATM系统中信令协议栈中缺乏呼叫／控制功能，提出了一种适合卫星并保证服务质量（ QoS）的分组交换系统点对点协议模型；同时根据卫星信道环境特点，适应性修改了Q．2931协议，并进行了工程可行性分析。
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