Based on monolithic integrated circuit automobile security alarm system design Abstract: Decodes the automobile security system using them on litchis integrated circuit interior resources realization jump code, it each time uses the remote control password all is changing, both enhanced the system security, and greatly reduced the cost. Keyword: Monolithic integrated circuit, Automobile security system , Code/decode Introduction Is unceasingly progressive along with the social economy and the high tech rapid development, in the routine work and the life, the automobile has e the people ideal transportation vehicle. But the following motor vehicle the case which robbed gradually is also in creased has created the pilot economical property loss. In order tore duce the automobile to rob the event the formation rate, for has the automobile the user to provide the safety control, simply develops one kind to be reliable, the ease of operation, can send out in the discovery normal condition to the pilot reports to the police the reminder and the security warning safety system has the practical significance. This article based on to the existing automobile security alarm system generalized analysis, develops one kind of brand-new security alarm system. This system has mainly used the jump code code/decoding principle, causes the overall system to be safer, greatly reduces password