To more reasonably evaluate the bearing capacity of the suspension bridge tunnel-type anchorage （TTA） and explore the failure process of these TTAs under dynamic loads， a numerical model is established using finite difference software. This involves extracting and analyzing the forms of stress and strain distribution on the contact surfaces and comparing them with results obtained under static loads. The research is further extended to establish the impact of various working conditions， examining the anchoring mass and dynamic load parameters that affect the bearing capacity. The results indicate that under dynamic load， the stress and displacement distribution patterns on the rock-anchor contact surface are similar to those under static loads. However， both the amplitude and the rate of increase are significantly higher than in the static load condition. The increase in displacement in the direction of the arch crown and the right arch foot reach 36% and 112%， respectively. At 7 times the amplitude of the static load， the displacement difference between the two reaches a “threshold value” of 0.30 mm. Under dynamic loading， the ultimate bearing capacity of TTA increases with the expansion angle， length， and spacing of the anchor plug. The sensitivity ranking of these geometric parameters from high to low is anchor plug length， anchor plug expansion angle， and anchor plug spacing. The impact of dynamic load frequency on bearing capacity is relatively small. Under dynamic loading， the ultimate bearing capacity of TTA significantly decreases， with an average reduction of about 21%. The sensitivity analysis of TTA bearing performance and influencing factors under dynamic loads provides a reference for the optimal design of TTA ultimate bearing capacity in practical engineering.