This article aims to propose the technical part and overview of workflow of our project: Remote control and security system of cars based on microcontrollers. Our proposed system mainly tends to control and defend cars in a long distance thanks to GSM network. First of all, literature review is discussed. Following this, research methodology is taken place in this article. Then, the explanation of whole system and circuit diagrams are depicted in the part of analysis and results. Eventually, finishing parts (Conclusion and References) are written.