ZHANG Qing is an independent researcher on Android security. Previously, he was a senior Android security researcher of Vulpecker Team of Qihoo 360 and visiting scholar of Model Checking Lab in National University of Singapore．He currently works as a senior information security engineer of Xiaomi, in charge of account risk control. His interests include Android security, web security and payment security, specializing in reverse engineering and fuzzing. His work has appeared at syscan360 2016. In 2016, he won whole year's first-place prizes in vulnerability detection of some major Chinese companies, such as Huawei, meizu and xiaomi.