The current oilfield monitor model in domestic is out of date which causes serious oil and facility stolen. Public security is not complete and efficient to prevent the crime. In order to solve this problem, Photoelectric Beam Detector has been adopt. This study utilizes Photoelectric Beam Detector, first transforming its information to electric signal and then with the help of Data Acquisition Module and GPRS technology, sending the message to monitoring and supervision center where possesses the security system software. The results indicate that it is an efficacious method to fulfill the security and pre-warning target.