As nearshore aquaculture space approaches saturation， offshore farming is gradually shifting from coastal areas to the deep sea. However， the marine environment in the deep sea is more severe， imposing higher demands on the structural safety performance of aquaculture facilities.The main structure of the truss-type aquaculture platform is rigid， offering excellent resistance to wind and waves as well as deformation. Research focuses on structural stability and stress characteristics， including platform attitude deviation， decay of restoring torque， capsizing risk， and mooring forces.To investigate the impact of mooring anchor chain failure on the hydrodynamic characteristics of truss-type aquaculture platforms， this study conducts a comparison of the hydrodynamic response characteristics of a truss-type aquaculture platform under two conditions： intact mooring system and single mooring chain failure based on physical model flume tests. The results indicate that mooring chain failure reduces the positioning capability of the mooring system on the aquaculture platform. Under irregular wave action， single mooring chain failure does not change the variation law of structural motion response with period，but it does change the amplitude of the motion response：the surge response of the aquaculture platform increases by a maximum of 7.45%， the pitch response increases by a maximum of 16.61%， and the heave response decreases by 3.99%. Meanwhile， as the significant period increases continuously， the influence of mooring chain failure on both surge and pitch responses gradually diminishes， while its influence on the heave response continues to increase. Under the action of irregular wave-current coupling， the changes in pitch response and mooring force on the wave-current-facing side are the most significant. After mooring chain failure， the effective value of pitch motion increases by 1.19 times， with a maximum tilt angle of 15.59°， and the effective value of mooring force on the incident wave-current side increases by 2.85 times. The research results provide a theoretical reference for the design of truss-type aquaculture platforms and their mooring systems in deep and open seas.