Civil high-tech companies， as an important technical support force， have participated in the conflict between Russia and Ukraine on a large scale. In combat missions such as precision strikes， situation investigation and supervision， command and control， and public opinion， they are closely integrated with different levels of forces and combat operations， showing a strong influence on the battlefield situation and the direction of war. The main civil high-tech companies that fought against Russia in the conflict are comprehensively sorted out. Their combat efficiency in modern war is studied from four aspects of the physical domain， information domain， cognitive domain， and social domain. Finally， the characteristics of their participation in the war are analyzed， and the countermeasures and suggestions of China are put forward.