Building the brand VI design of the world's top 500 enterprises is a huge and strategic task, which requires a deep understanding of the company's values, goals, audiences and market positioning. Here are some suggestions to consider when designing. 
1. In-depth understanding of the enterprise
Before you start designing, it's crucial to have a deep understanding of your business's core values, mission, and vision. Understanding the company's history, culture, target audience, and competitive environment will help ensure that the VI design aligns with the identity and goals of the business.
2. Develop a brand strategy
VI design should be part of a comprehensive brand strategy that identifies the brand's positioning, differentiation and target market, and then ensures that VI design is consistent and powerful in communicating these aspects.
3. Emphasize uniqueness
Fortune 500 companies often face stiff competition in the market, so their VI designs need to be unique. Ensure that the design stands out in the industry while remaining consistent with the corporate values.
4. Establish a brand identity system
Develop a strong brand identity system that includes logos, fonts, colors, and graphic elements. This will ensure consistency across a variety of platforms and enhance brand recognizability.
5. Focus on scalability
Fortune 500 companies may be involved in multiple business areas and markets, so the VI design needs to be well scalable to ensure that the design can be applied in different cultures and business environments. 
6. Use advanced technology
Today's technological developments offer more possibilities for brand vi design. Consider how you can enhance your brand image with virtual reality, augmented reality, or interactive**.
7. User experience (UX) design
Fortune 500 companies usually offer a variety of products and services, so VI design should consider user experience. Ensure that the design provides a consistent, enjoyable, and easy-to-understand user experience across platforms.
8. Social consistency
In the era of social **, the VI design of the brand needs to be consistent across different social platforms. Adapt design elements to a wide range of sizes and formats and ensure they are legible on different screens.
9. Engage key stakeholders
Communicate with key stakeholders (employees, customers, investors, etc.) inside and outside the business to capture their feedback and expectations. This helps to ensure that the design is widely accepted.
10. Regular update and maintenance
VI design is not set in stone and should be updated and evolved over time. As the market and technology change, the brand image also needs to be constantly adjusted to stay relevant.
Overall, successful brand vi design requires deep strategic thinking, professional creative execution, and close collaboration with all parties. Through meticulous planning and comprehensive execution, it can be ensured that the brand VI design can effectively convey the values of the enterprise and win the trust of the market and consumers.