Aiming at the equipment effectiveness evaluation requirements of infantry unit urban combat simulation system, research the infantry unit urban combat simulation system based on HLA. Establish the simulation system gross structure, define the sub-system structure and function, and introduce the key technology and application method such as infantry unit urban combat simulation military model, urban landscape measurement model, firing and damaging model. According to the motorization infantry team block attack battle to decide and describe simulation process. The simulation result shows that the system can realize the urban confronting simulation between red and blue teams and provides effective ration data for urban combat equipment effectiveness evaluation.