Abstract: The international cyber security situation is becoming increasingly serious, and using cyber attacks to destroy national critical infrastructure is the first means of large-scale war in large countries. Foreign developed countries have built critical information infrastructure cyber ranges and carry out large scale and comprehensive cyber security exercises regularly. This paper studied the characteristics and trends of critical information infrastructure cyber security attack and defense drills at home and abroad in detail, analyzed the gap of them, presented a cyber security attack and defense drill scheme of power critical information infrastructure, carried out the cyber security attack and defense drill practice of power monitoring system, and improved the actual combat level of power cyber security attack and defense in China.