This paper presents a seamless transmission technique for Non-Geostationary Earth Orbit(NGEO) satellite networks.The seamless transmission technique combines the concept of Hop-by-Hop and network coding to alleviate the negative impacts of handovers,high bit error rate,and long delay,and to achieve high throughput and complete delivery in NGEO satellite networks.This network coding algorithm is able to maintain expected small queue size and low decoding latency.Furthermore,the seamless transmission technique applies a novel explicit congestion notification mechanism and can achieve high bandwidth utilization.Various aspects of this seamless transmission technique are evaluated. This paper presents a seamless transmission technique for Non-Geostationary Earth Orbit (NGEO) satellite networks. The seamless transmission technique combines the concept of Hop-by-Hop and network coding to alleviate the negative impacts of handovers, high bit error rate, and long delay, and to achieve high throughput and complete delivery in NGEO satellite networks. This network coding algorithm is able to maintain expected small queue size and low decoding latency. Morerther, the seamless transmission technique applies to a novel explicit congestion notification mechanism and can achieve high bandwidth utilization.Various aspects of this seamless transmission technique are evaluated.