The design of vertical parking garages requires consideration of the following aspects:

1. Structural Stability: The structure of a multi-level parking garage must be sufficiently stable to bear the weight of vehicles and withstand the forces during the parking process. Various forms, such as steel structures or concrete structures, can be employed to ensure structural stability.

2. Space Utilization: To maximize the use of space in multi-level parking garages, increasing height is essential. Multi-level designs or sloped parking spaces can be implemented.

3. Parking Efficiency: To enhance the efficiency of vehicle parking and retrieval, automation design can be implemented. For instance, using lifting devices and mechanical arms to achieve automated vehicle storage and retrieval.

4. Safety Features: Vertical parking garages must have certain safety features, such as collision avoidance systems and emergency braking devices. Additionally, the electrical system's safety and the completeness of fire protection facilities must also be ensured.

5. Environmental Performance: The design of the multi-level parking garage must consider environmental performance, such as incorporating low-noise design and energy-efficient equipment to minimize environmental impact.

In summary, the design of vertical multi-level parking garages must take into account multiple aspects, including structural stability, space utilization, vehicle access efficiency, safety performance, and environmental performance. In the specific design process, detailed planning and calculations are necessary to ensure the safety and reliability of the parking garage.