Abstract: An assembly system is provided for automotive lamps and an operation method thereof. In the invention, three kinds of function robots are responsible for the transmission work of the workpieces among various functional stations, which realizes automatic coating, fastening, and whole lamp performance testing, etc., and reduces the amount of manual intervention and improves the process integration. By setting a reasonable turnover area, the waiting time caused by the difference of transmission rate among processes is shortened. Meanwhile, the invention provides an assembly system with a bilateral assembly line operating simultaneously, which greatly improves the efficiency of the assembly system.