Hello, yes, OPPO's flash charger can be used to charge the OnePlus phone. Oneplus uses Dash charging technology, while OPPO uses VOOC flash charging technology. The two are not exactly the same, but both are fast-charging technologies that can quickly charge a phone in a short period of time. Therefore, you can use OPPO's flash charger to charge the OnePlus phone, and the charging speed will be faster than the ordinary charger.