Recently with the rapid development of smart phones and mobile Internet, network security is more and more important in people's daily life. In this paper, a network security scanning system based on Android (wScan) is proposed, which aims to make sure users' mobile terminals are in a secure network environment when they are using these devices. The system is composed of WiFi scanning, router tracking, port scanning, running service detection, virus killing and real-time communication functions, which integrates Java technology, Eclipse platform and SQLite database. Using Nmap toolkit in the system, the wScan can provide valuable information of running services and opening ports in mobile devices based on Android.