Abstract: The five-quark system including an anti-quark has been studied by the chiral SU(3) quark model .Four-quark subsystem wave function has been derived and established ,and has been coupled a an antiquark.Pentaquarks wave functions have been set up.Then quark-quark and quark-antiquark potential have been calculated in all interactions in the Jacobian coordinate system ,and through the transformation of T-M ,the structure of diamond of pentaquark of 20 ground-state energies have been calculated out in the same Jacobian coordinate.