Abstract This text primarily introduced Elevator control system that based on SCM (Single-Chip Microcomputer) control system and hardware from some of the major minimum system modules, elevator between circuit blocks, lift circuit module, floors detection module, the motor drive module, alarm module composed of seven parts. The system uses SCM (89 C51) as a core control, the use of internal and external strokes press the button or not arising from the level of change, as users request information sent to the microcontroller, motor control microcontroller rotation, the floor under the SCM Test results parked motor control in the target floor. Floor detection using photoelectric sensors, motor control part of a DC motor and H-bridge driver. Some use of assembly language software, the use of methods to detect interrupt the user requests the key information, according to the lift operation to the appropriate floor, a photoelectric sensor-level changes to the SCM count to determine the number of floors, and sent to the digital display. Hardware design is simple and reliable, the combination of software, basically a four-story elevator operation of the simulation. Key words: AT89C51; elevator control system;