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In the process of transmitting far-sea target detection data to the ground, the low earth orbit(LEO) satellite network has the advantages of low cost and low delay. LEO satellite constellation is large in scale, on-board resources are limited, and load distribution is uneven, so it is important to design a reasonable routing algorithm to improve the quality of data transmission. To solve this problem, a routing algorithm based on neighbor node attributes is proposed. According to the candidate order attributes and comprehensive load attributes of neighbor satellites, the forwarding probability is reasonably allocated to provide a more adequate route selection for avoiding congestion. The simulation results show that compared with the traditional algorithm, the average delay and packet loss rate of the proposed algorithm are optimized, which can ensure the efficient and reliable transmission of detection data.