From the perspective of the main body of regional brand construction, through qualitative coding based on the grounded theory, a dimension scale of regional brand trust based on the perspective of the main body of construction is developed, including five dimensions of government system trust, government support trust, industry governance trust, enterprise norm trust and enterprise consciousness trust. Exploratory factor analysis and confirmatory factor analysis were used to test the reliability and validity of the scale. Conclusion it is suggested that regional brand trust should be built by the government, industry associations and enterprises, and government functions should be optimized to stabilize regional brand development environment and strengthen institutional protection. The industry association should restrain the enterprise cluster, unite the multi-department collaborative governance, and enhance the regional brand cohesion; Enterprises build their own good image, increase the emotional communication between customers and brands, and enhance the attraction of regional brands.