Abstract: A crossover point approach was studied for low-cost LEO cluster precise orbit data to recover the global time-variable information without accelerometer system (ACC) or k-band ranging system (KBR) measurements. This approach can reduce the non-gravitational force effects on LEO, obviously. In this paper, we analyzed data coverage and the orbit radial error effect on this approach based on COSMIC (Constellation Observing System for Meteorology Ionosphere & Climate) satellites data. And then, the the low degree zonal harmonic terms, C20 and C30, simulation results of the approach were given.