Abstract: Focusing on the combustion characteristics and engineering application value of the constant-pressure sequential burner equipped in the GT36-S5 gas turbine, the structural principles and combustion adjustment mechanisms of the burner in actual operation were systematically elucidated. The effects of characteristic parameters, such as fuel staging ratio, combustion pressure pulsation frequency, and temperature distribution, on the operational stability of the unit were analyzed. By analyzing the process parameters of combustion adjustments under actual operating conditions, the nonlinear response laws of the gas turbine combustion during dynamic load changes were revealed. Specifically addressing the low-temperature operating scenario in winter, the effects of various factors, including fuel staging ratios at various stages, the MET setpoint, and C₂₊ content, on combustion stability, pulsations in different frequency bands and NO_x emissions were analyzed. Results show that the obtained combustion characteristic analysis provides a critical basis for the operation and maintenance of the unit. It can guide on-site personnel to improve combustion stability and equipment reliability in complex environments by adjusting the gas turbine load, the residence time at different load stages, offering significant engineering reference value for the operation optimization of similar heavy-duty gas turbines.