We investigate the quantum numbers of the pentaquark states Pc+, which are composed of 4(three flavors) quarks and an antiquark, by analyzing their inherent nodal structure in this paper.Assuming that the four quarks form a tetrahedron or a square, and the antiquark is at the ground state, we determine the nodeless structure of the states with orbital angular moment L ≤ 3, and in turn, the accessible low-lying states. Since the inherent nodal structure depends only on the inherent geometric symmetry, we propose the quantum numbers JP of the low-lying pentaquark states Pc+ may be 3-/2 , 5-/2 , 3+/2 and 5+/2, independent of dynamical models.