At present,the huge commercial constellations in low orbit are booming,which will inevitably have a disruptive influence on the space debris environment.It has become a problem that needs attention in the development of LEO satellites.It must be dealt with as soon as possible and actively responded,and reasonable countermeasures have been proposed.Based on the existing LEO space object distribution model,this paper takes the deployment of the typical constellations of OneWeb constellation and Starlink constellation as examples,and carries out a quantitative analysis of the spatial density distribution,collision probability distribution growth and change law of the corresponding orbital heights.At the most influential height,its growth rate is close to 18 times.It can be seen that the deployment of a giant commercial constellation will bring a huge increase in collision risk to spacecraft operating within its orbital height range.The deployment orbit selection of the LEO satellite needs to pay attention to this risk.