A deep space multi-file delivery protocol(DSMDP) based on LT codes is proposed to reduce the influence of long delay and a high bit error rate(BER) in deep space communication. The protocol increases sending redundancy by LT codes to improve the success rate of file delivery, and adopts different protective strategies for different situations of packet loss. At the same time, the multi-file united delivery strategy is adopted to make full use of the retransmission time to reduce the end-toend transmission delay. Furthermore, the protocol determines the quantity of encoded packets according to the feedback for controlling redundancy. The simulation results show that the proposed protocol can significantly reduce the transmission delay of files, which would be effectively suitable for deep space communication environment of high BER and long delay. A deep space multi-file delivery protocol (DSMDP) based on LT codes is proposed to reduce the influence of long delay and a high bit error rate (BER) in deep space communication. The protocols increasing delivery redundancy by LT codes to improve the success rate of file delivery, and adopting different protective strategies for different situations of packet loss. At the same time, the multi-file united delivery strategy is made to make full use of the retransmission time to reduce the end-toend transmission delay. the protocol determines the quantity of encoded packets according to the feedback for controlling redundancy. The simulation results show the proposed protocol can significantly reduce the transmission delay of files, which would be suitable for deep space communication environment of high BER and long delay.