Abstract: The ring current is an electric current flowing westward around the Earth from 2 to 7 Re. Changes in this current are responsible for global decreases in the Earth＇s surface magnetic field, which are known as geomagnetic storms. The ring current formed primarily through injection driven by strong convective electric fields, E x B drift and subsequent trapping of particles from the plasma sheet into the inner magnetosphere during main-phase of storms. And ions will scattered into atmosphere by precipitation of loss cone. Based on the model of ring current ion distribution given by simulation, the distribution of ions with different energy by varians convective electric fields and ions pitch angle distributions are researched and the physics of these distributions is discussed.