The manuscript with the title: Study on Surface Properties of Aramid Fiber modified in Supercritical carbon dioxide by glycidyl POSS. The manuscript can be published in Polymers, the manuscript has valuable information about grafting of glycidyl-POSS with Aramid Fiber for improving the surface of the fiber. There are two different methods to modify the surfaces of fibers: 1. physical treatments such as corona or plasma treatments under different condition;2. chemical treatment by chemical grafting with hydrophobic or hydrophilic molecules. The Authors are used different techniques to characterize the fiber before and after grafting like X-ray photoelectron, infrared spectroscopy, and TGA, etc. It is necessary to write a simple comment in the text on figure 6 and 7 to explain how the chemical reaction between aramid fiber and glycidyl-POSS occurred. In general, the manuscript is well written.