[Objective] Given the challenge of meeting commercial standards for hydrate extraction due to low efficiency, ultrasonic
waves can be employed to catalyze hydrate decomposition through various effects generated during their propagation in the medium.
Exploring the characteristics of hydrate decomposition under multiple influencing factors with various interactive relationships, such
as ultrasonic power ratios, action durations, and intervals, is of great significance to promoting the application of ultrasonic waves in
the hydrate mining process. [Methods] Single-factor experiments were conducted to investigate the effects of ultrasonic power ratios,
total action durations, single action durations, and intervals on the decomposition characteristics of hydrate slurry. Building on this,
the optimal combinations of ultrasonic parameters for promoting the decomposition of CO2 hydrate slurry were determined through
orthogonal experiments and experiments based on the response surface methodology. [Results] Gas production from the
decomposition of CO2 hydrate slurry increased with higher power ratios, longer total action durations, longer single action durations,
and shorter intervals. The effects of these factors on gas production were identified in descending order as follows: total action
durations, single action durations, intervals, and ultrasonic power ratios. The interactive relationships among the factors were found
to have influence on the selection of ultrasonic parameters for optimal combinations. Specifically, the optimal combination identified
from orthogonal experiments consisted of a power ratio of 70.0%, total action duration of 8.0 min, single action duration of 8.0 s, and
an interval of 2.0 s, resulting in a maximum gas production rate of 0.07 mol. In contrast, the optimal combination determined through
response surface methodology included a power ratio of 67.7%, total action duration of 7.5 min, single action duration of 7.2 s, and
an interval of 5.0 s, yielding a maximum predicted gas production rate of 0.065 mol. [Conclusion] The research results provide
additional insights to supplement existing studies on the influence of ultrasonic parameters on the decomposition characteristics of
hydrate slurry, establishing a crucial theoretical foundation for ultrasonic-assisted hydrate mining.