The authors developed an experimental apparatus which was applied to analyze the hydraulic fracture mechanism in synthesized hydrate bearing sediments. They discussed the basic principles of this apparatus and gave the preliminary experimental data. Generally speaking, the design concept of the apparatus is novel and practical. I have several questions for the authors to clarify.

1. Please check your language with a native speaker.

2. The labels of Figure 3 and Figure 4 can be more clearly.

3. The conclusion can be slightly expanded, and include some specific future work as well. This system may be applied to CO2 geology sequestrated in the saline aquifer.

This paper discussed the instruments for reservoir reformation behaviour of the hydrate-bearing sediments. Hydraulic fracturing is one of the useful stimulation technologies widely applied to the “shale gas revolution” , it is also significant to enhance production technology for gas hydrate. Overall, the manuscript is well-organized. But I also find several points and parts that need to be revised to enhance the audience reach prior to acceptance for publication. The detailed comments are as follows:

1.The language of this manuscript can be further improved to enrich the audience.

2.There are some small issues and typos (capitalization, double punctuations). Please make a thorough check. 

3.Some legend of figures are too small, it is hard to read in paper.

4.What is the temperature of the pre-cold water, and whether it will affect the hydrate dissociation during the permeability test?

5.Whether the difference between the two synthesized hydrate samples will affect the properties of the reservoir?

6.The change of hydrate reservoir permeability after hydraulic fracturing is not described in the paper?

The manuscript developed an experimental facility and conducted experiments to investigate the hydraulic fracture mechanism in synthesized HBS, which is a commendable endeavor and of significant importance for the research on methane recovery from gas hydrate reservoirs. However, a few aspects need to be addressed to improve the quality of the manuscript.

In Figure 7, the temperature curves and the corresponding axis are missing.

The author should explain the method they use to measure the permeability of the sediments before and after hydraulic fracture. This detail is crucial for understanding the experimental procedure and interpreting the results accurately.