To enhance the cage’s resistance to extreme sea conditions,a ballast water system was designed in compliance with regulatory requirements,and buoyancy tests were conducted at the farming site. During the trials,two methods -inclination sensor and liquid level telemetry conversion-were employed to monitor the cage ’s inclination. The results demonstrated that : The cage’s buoyancy process lasted approximately 6 hours, meeting design specifications; Buoyancy speed exhibited a negative correlation with the cage’s cross-sectional area,with pronounced velocity fluctuations observed at sectional transition points; The maximum measured horizontal/longitudinal angles reached -2. 5° and 1. 25° respectively,while calculated values peaked at -1° and 1° ; The inclination data from both measurement methods showed consistent trends throughout the test. The ballast water system's performance was confirmed via buoyancy testing,where the inclinometer's enhanced sensitivity facilitated real-time net cage tilt detection. The dual-monitoring approach provided high-precision data for the optimization design of deep-sea cages.