In this thesis, an embedded system is designed and implemented for cloud monitoring issues. The cloud monitoring system consists of software setup and hardware aspects. An Arduino Yun board is chosen to be used as the platform, and two Pyro-electric InfraRed sensors (PIR sensors) as well as a camera are set for the purpose of monitoring. Once the PIR sensors detect someone close to the system, not only a buzzer will sound audio warning, the camera will take photos, but also the system will sent the photographs to a predefined cloud system which is set by Dropbox and will alert users via email simultaneously. Users can decide to live-stream or to process after receiving the mailed message. In order to show the efficiency of the cloud monitoring system, some experiments are shown at the end of this thesis. According to the experimental results, the cloud monitoring system works well no matter in day and night. Users can remotely control this system and live-stream via cellphones. The requirement for real time of the embedded system can also be guaranteed.