Measurement and characterization technologies of high and low temperature stability, oil separation, and medium resistance of new colloidal sealant for aircraft structures were investigated, and the main technical index system was established. The corrosion protection performance of new colloidal sealant was thoroughly assessed and validated using "distilled water + EXCO dipping" laboratory accelerated simulation environmental test method. The experimental results showed that this kind of new colloid seal waterproof technique has the characteristics of good thermal stability, high involatile content, low oil separation, strong medium resistance, always maintain colloidal substance at temperature from -60 to 180℃, which meets the application demands of un-solidification under low temperature and no fluidity under high temperature, and has dual functions of seal waterproof and anticorrosion, which are especially suitable for solving the seal waterproof problems of aircraft structures.