Abstract: For the low earth orbit satellite communication， in view of the characteristics of low altitude， fast speed and frequent switching， single channel allocation strategy cannot improve the experience of more users and the utilization of channel resources under a low traffic scene. The adaptive channel reservation strategy based on differential evolution algorithm for high traffic conditions is proposed， which dynamically adjusts the number of channel reservation to ensure the timely access of high priority users. For low traffic， the non-reserved channel allocation scheme is put forward to meet the ideal bandwidth requirements of high priority users and to make full use of the channel resources of the system. In addition， to further improve the user experience， taking into account the comprehensive priority， the enhanced queuing strategy allows users that are unable to access to join the waiting queue temporarily when all the cell channels are occupied. Experiments show that the scheme can effectively improve the utilization rate of system resources and guarantee the quality of service of high priority and user experience， and make the whole system service quality better.

Key words: LEO satellite communication, channel reservation, non-reserved channel assignment, enhanced queue