In order to accelerate the implementation of the paired approach in the closed spaced parallel runway airport in China, the human-machine loop thought is first used to study the possible risk factors in the paired approach operation, and the relationship between different risk factors is analyzed. Then the relationship is established. Explain the structural model to study the relationship between various factors. The final analysis shows that the human factor is the most critical factor in the pairing approach. In the operation of the pairing approach procedure, the controller is the core factor in the success of the pairing, and the communication between the pilot and the controller needs to be strengthened.