Abstract: This paper analyzes the challenges in developing elevator group control systems and employs Siemens S7-1200 PLC and TIA Portal for modular programming.For the control characteristics of three ten-story elevators, judgment programs for upward peak, downward peak, lunch peak, inter-floor commuting, and idle modes are established.Comprehensive control is achieved through the shortest distance, shortest time, and comprehensive evaluation algorithms.Utilizing WinCC,a human-machine interface is designed to implement system control and monitoring.The algorithm is validated using Siemens S7-1200 PLC and the EET simulation platform.Results show that in peak modes, the average elevator travel time is reduced by approximately 14.38 %,and the average waiting time is reduced by approximately 29.85 %,demonstrating that the group control algorithm is more efficient and energy-saving compared to traditional methods.