Abstract: Orbital evolution of RKBOs is simulated by using reliable orbital elements over a timescale of 10⁸ year.It shows that their orbits are relatively stable in resonant regions.Stability depends on initial orbital semi-major axis,eccentricities and inclinations of these resonant bodies.According to dynamical behavior of orbital semi-major axis,eccentricity and inclination,RKBOs are classified into regular or chaotic orbits.