Flame photometer is mainly used for detecting concentration of alkaline metal ion in solution, and has been widely used in medical care, agriculture and industry. Currently, the flame photometric control system is poor in scalability and too complicated in operation, for it mainly consists of the MCU circuit or general integrated circuit. Therefore, an improved flame photometric control system was put forward, adopting S3C2440 as master chip, using the Linux operating system and touch screen operation interface, with software to realize calibration. Detailed analysis was given for the working principle of the flame photometer, hardware design and software realization of its control system. The whole system is having a friendly man-machine interface, an easy operatability, a high degree of intelligence and a low power consumption. It is also stable and reliable.