［Objective］To address the issues of poor drying performance in low-temperature field environments and difficult application of rain erosion-resistant antistatic coatings for radomes.［Methods］A color paste was prepared using polyester polyols，pigments，and conductive fillers. An NCO-terminated elastic prepolymer was synthesized from this color paste，trimethylolpropane（TMP）， and isophorone diisocyanate（IPDI）. Subsequently，a one-component elastic repair coating for radomeswas developed using the NCO-terminated elastic prepolymer，N-［（triethoxysilyl）methyl］aniline（ND-42），and anti-aging additives and organic matting agents. The structure，molecular weight，and molecular weight distribution were characterized using Fourier transform infrared spectroscopy（FT-IR） and gel permeation chromatography（GPC）. The effects of different silane coupling agent modificationson the coating's elastic properties and application performance were investigated，along with the impacts of conductive fillers，various matting agents，and anti-aging additive dosages on the coating ..s antistatic properties，UV aging resistance，and surface characteristics.［Results］ A one-component elastic protective coating was successfully developed，capable of curing under field conditions（5-40 ℃， RH=20%-75%）. The coating modified with ND-42 and matted with organic matting agents exhibited excellent elasticity，good wear resistance，and a smooth，fine surface texture. Incorporation of conductive fillers achieved surface resistivity of 0. 5-10 MΩ while enhancing tensile strength. Afteradding the compound anti-aging additive，the coating remained free from powdering，cracking and ΔE= 2. 1 after 1 000 hours of UV aging.［Conclusion］ A protective coating suitable for field repair of radomes had been successfully developed. This coating provided a feasible approach for repair applications in the field of radomes.