The Russia-Ukraine conflict has witnessed new application styles of unmanned aerial vehicles （UAVs） such as “order strike”， “space-based star chain interconnection”， and “low-cost large-scale application”， which create classic cases of “the smaller defeats the bigger”. The conflict provides a “testing ground” for the systematic application of UAVs in modern warfare. Based on the open source intelligence information， this paper systematically combs the UAV equipment of the Russia-Ukraine conflict. Based on typical UAV combat cases， this paper analyzes the new characteristics and styles of UAV operation application in the process of situational awareness， battlefield communication， command and control， and strike confrontation. From the perspective of equipment construction， this paper proposes countermeasures and suggestions for high-cost-effectiveness-ratio defense of UAVs.