As political boundaries, countries and cities as administrative boundaries may restrict the flow of goods and factors. Economic openness is to weaken the economic boundaries of countries and cities and promote the flow of goods and factors. As a super-large economy, China has actively promoted both opening-up to the outside world and domestic opening-up, integrating into the international economic circulation system and building a unified domestic market, creating a high-quality business environment for enterprises. The improvement of the environment has enhanced entrepreneurial performance and promoted technological innovation of small enterprises and urban economic prosperity. The research shows that there is an inherent and necessary connection between the degree of openness, business environment, and entrepreneurial performance. Economic openness and business environment promote the formation of a high-quality entrepreneurial environment, which in turn affects entrepreneurial performance and economic development performance. Namely, various changes in the business environment have greatly affected the "business dynamism".