Abstract: Aiming at the collision safety of large-scale constellation satellites in low Earth orbit（LEO），the maximum drift of constellation configuration was studied.Firstly，the minimum phase difference of satellite orbit plane was calculated based on the spherical triangle theory.Secondly，the constellation configuration parameters were studied by using the control variable method.The influence of configuration parameters on the minimum phase difference of constellation satellites was analyzed，and the relationship between the right ascension drift and the minimum phase difference was analyzed.A cooperative design method of constellation configuration parameters based on the minimum phase difference was proposed.Then，based on the relative phase analysis method，the function relationship between the right ascension drift and the phase drift with time was established.Finally，the first phase of Starlink constellation was taken as a reference object to verify the rationality of the collaborative design method of configuration parameters.

Key words:  , low orbit large-scale constellation；maximum drift；phase difference；constellation configuration；inter satellite security