ing at the shortcomings of low optical trap stiffness and poor axial stability in dual-beam optical trap, a four-beam optical trap is proposed to capture and manipulate particles. Using ray optics model, the differences in mechanical characteristics between the dual-beam optical trap and the four-beam optical trap are compared and analyzed, and a four-beam optical trap chip is designed and fabricated. Polystyrene microspheres with radius of 5 μm are captured and the axial optical trap stiffness is calibrated by mean square displacement method. Both simulations and experimental results show that the stiffness of the axial light trap in the four-beam optical trap is comparable to that of the transverse optical trap in the dual-beam optical trap, and is much larger than that of the axial light trap in dual-beam optical trap. While maintaining the lateral capture stability of dual-beam optical trap, the four-beam optical trap improves the axial capture stability, and is of great significance for stable manipulation of micro-particles.