Abstract: In this paper, a special ABS/PET/PBT blend used for battery shells was designed to improve the oil resistance of ABS resin, and meanwhile, the compatibility between PET/PBT blends and ABS resin was enhanced. The results indicated that the impact strength of ABS/PET/PBT compound was improved to 17 kJ/m2. The oil resistance test indicated that the ABS/PET/PBT blend could prevent the corrosion of battery shells by brake oil, when the blend contains 30 wt % of PET/PBT.