Truss-type aquaculture cages is significant for the development of equipment-based marine ranches to alleviate the pressure of nearshore aquaculture and ensure food security. The application of deep-sea aquaculture cages will greatly facilitate the spatial expansion of China's aquaculture and the transformation of production models, and enhance the utilization capacity of deep-sea and fishery resources. Therefore, the development of truss-type aquaculture cages with strong resistance to marine environmental loads, intelligence, and safety has received extensive attention in the field of fishery aquaculture. Most truss-type aquaculture cages are deployed in open seas, and the harsh marine environment poses a significant threat to the structural safety of the cages. At present, the research on truss-type aquaculture cages mainly focuses on the overall motion of cages and tension response of mooring cables under the influence of marine environments. Little attention was paid to the structural loads, such as structural strain load. However, structural strain load may cause fatigue damage of the cage structure, leading to major safety accidents and economic losses. Although the structural safety analysis of gravity cages can provide reference for truss-type aquaculture cages, the structural safety analysis of truss-type aquaculture cages is still scarce. The structure dynamic response characteristics of truss-type aquaculture cages under the action of regular waves need to be studied. A flume test was conducted based on fiber optic sensing technology for the truss-type aquaculture cage model. The test was carried out in the wave flume of the School of Civil Engineering and Architecture, Shandong University of Science and Technology. The prototype of the cage was the "Deep Blue 2" aquaculture cage. A capacitive wave height meter was used to accurately control the wave parameters in the test. Considering the size of the test tank, the scale ratio of the cage model was determined to be 1:80. The cage model was anchored using a four-point mooring method, with four mooring ropes fixed to columns C3, C5, C9, and C11 of the cage model. Ten points on columns C1 and C3 were selected for monitoring, and fiber Bragg grating strain sensors were used to measure the structure strain of the columns C1 and C3. The strain response of columns C1 and C3 were measured under the action of regular waves. In this study, a Butterworth band-pass filter was used to denoise the structural strain data. The upper limit of the Butterworth band-pass filter's cut-off frequency was set to 10 Hz, and the lower limit was set to 0.1 Hz. In order to quantitatively evaluate the filtering effect of the filter, the variance of the first-order difference of the strain data before and after filtering were calculated. The first-order difference variance of the strain before filtering was 1.16, and after filtering, it was 3.7×10-4. It could be concluded that the Butterworth band-pass filter significantly reduces the fluctuation of the strain data, which is beneficial for subsequent feature extraction of the strain data. The peak frequency, peak amplitude, and effective bandwidth of the strain data were statistically analyzed. The results show that the energy of the structural strain data was mainly concentrated within one to three times the frequency of the incident wave. To avoid resonance in the aquaculture cage, the inherent frequency of the aquaculture cage should be outside one to three times the frequency of the incident wave. The strain response of column C1 was caused by both wave loads and inertial forces due to aquaculture cage motion. The high-frequency impact load, which was caused by wave loads, dominated on column C1 and caused high-amplitude transient strain in column C1 in the short period range of 0.8s to 1.2 s. As wave height increased, wave loads became larger, and the resulting structural strain also increased. In the long period range of 2.4s to 2.8s, the wave period gradually approached the inherent period of the floating aquaculture cage and caused significant motion response of the cage. The global kinetic energy of the floating aquaculture cage was converted into the internal structural internal forces (for example, axial force, shear force, bending moment) by stimulating a huge inertial force, thereby causing a significant increase in the strain of the cage structure. The strain response of column C3 was caused by wave loads, inertial forces due to aquaculture cage motion, and mooring cable tension. During the movement of an aquaculture cage, a stress wave was generated at the moment the mooring cable tightened, causing stress concentration at the fairlead point (where the mooring cable was connected to the aquaculture cage), resulting in a significant increase in the effective value of the strain of column C3. During the safe operation and maintenance of the aquaculture cage, the fairlead point areas are the key areas that require special attention. The research results can provide theoretical support for the optimal design, safe operation and maintenance of truss-type aquaculture cages.