Orbital motion of test particles in regular Hayward black hole space-time

In this paper, all possible orbits of test particles are investigated by using phase plane method in regular Hayward black hole space-time. Our results show that the time-like orbits are divided into four types: unstable circular orbits, separates stable orbits, stable hyperbolic orbits and elliptical orbits in regular Hayward black hole space-time. We find that the orbital properties vary with the change of $\mathrm{\ell }$ (a convenient encoding of the central energy density $3\mathrm{/}8\pi {\mathrm{\ell }}^2$). If $\mathrm{\ell }=\frac{1}{3}$ and $b<3.45321$, the test particles which moving toward the black hole will definitely be plunging into the black hole. In addition, it is obtained that the innermost stable circular orbit happens at $r_{min}$ = 5.93055 for $b$ = 3.45321.