With the continuous progress and development of society , people's incomes increase greatly, and more attention is paid to improve the safety of their living conditions as well as the reliability of life quality. An expert system of Security Alarm Monitoring for Smart Home filed based on JESS is demonstrated in this paper, according to the tendency development of security market worldwide and the deep-level development of security technology. The security system proposed in the paper is based on the knowledge of Expert System, Embedded Technology and Wireless Sensor Technology.etc. It mainly includes Access Control Subsystem, Steal Precaution Subsystem, Fire alarm subsystem, Gas Leak Subsystem. etc. The expert system based on Jess rules engine is developed by Java. It is able to detect whether the family members and family situation in a safety state according to the various scenes within a family, then make timely reaction to non-security state and take appropriate measures to ensure security at home guided by a set of procedural rules .The effectiveness and feasibility of this system has be proved by the simulation results.