||Most of aromatic polyimide has excellent physical properties, but it has a dark brown color making it difficult to apply to a display field requiring colorless and transparent optical properties. In this study, a transparent polyimide with good physical properties was prepared by the thermal imidization to solve this problem. To improve the physical properties, it was added TEOS or APTMS to 4,4'-(Hexafluoroisopropylidene)diphthalic anhydride (6FDA) and TFMB to create a crosslinked structure using a sol-gel process. The structure of the resulting polyimide was analyzed by fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and UTM. It was found that the tensile strength of the polyimide polymer made by adding water to 6FDA, TFMB, and APTMS increased as the content of water increased, that is, as the APTMS content decreased and the TEOS content decreased.