This paper proposed a terminal sliding mode control method based on disturbance observer for gyroscope chaotic system. Compared with traditional sliding mode control method, the control objective in this paper is not only to stabilize the sliding mode variable within a limited time, but also to accurately estimate unknown function, the dead zone input errors and the external disturbance. Therefore, the research in this paper is interesting. The reviewer is happy to recommend its acceptance after minor revisions.1. Need to modify the introduction part of the manuscript, not all the literatures were introduced again, it is a brief description of the work that has been studied.2. Some grammatical and spelling errors in the paper need to be corrected. i.e. “…which can estimate the influence of the disturbance and compensate it further.”3. A further explanation is needed for disturbance observer.4. The comparison of simulation results needs further explanation to emphasize that the control method in this paper is better.