LT码是喷泉码的一种,由于其优异的性能得到了广泛的应用,其中,分布式LT码在有中继传输的深空通信中特别适用,但是它必须满足各个信源发送的数据信息包长度相等,在实际通信中,每个中继传输的信息数据量不一定相等,数据重要程度也会有所不同,本文针对这个问题设计出了分布式不等差错保护LT码,在编码时通过对信源包的选择策略进行调整实现对重要数据的保护,仿真结果证实了我们提出策略的有效性。 LT code is a type of fountain code, which has been widely used due to its excellent performance. Among them, the distributed LT code is especially suitable for deep space communication with relay transmission, but it must satisfy the data information sent by each source In the actual communication, the amount of information and data transmitted by each relay is not necessarily the same, and the importance of the data will be different. In this paper, a distributed unequal error protection LT code is designed for this problem, The key data protection is achieved by adjusting the selection strategy of source packet. The simulation results confirm the effectiveness of our proposed strategy.