Unmanned aerial vehicle （UAV） has played an increasingly important role in recent military conflicts due to its low cost and high flexibility. This attracts wide attention from countries around the world. The number of “black flights” of UAVs in China is increasing year by year， which directly reflects the challenges of the prevention and control of low-altitude airspace UAVs. The construction of urban low-altitude airspace anti-UAV is worthy of further research. As for the urban low-altitude airspace anti-UAV problem， the possible UAV threats were analyzed. The urban anti-UAV scenarios were classified， and the challenges and problems of the urban anti-UAV were explored. Additionally， five solutions to the urban anti-UAV system were proposed. In conclusion， for the construction of the urban anti-UAV system， the positive design oriented to the target and scenarios should be conducted， and special attention should be paid to the UAV target and environment characteristics， the anti-UAV point position design， the integration of the command and control system design with user operations， and the standardization of system integration. This can provide a reference for the urban anti-UAV system design.