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This paper about the high-quality development level of Beijing-Tianjin-Hebei region is of vital importance to promote high-quality development of China. An evaluation index system that can comprehensively describe the high-quality development of the Beijing-Tianjin-Hebei region is designed in this paper. There are 27 indexes selected to evaluate the high-quality development of the cities in Beijing, Tianjin and Hebei province from three dimensions: target level, standard level and index level. By applying the SOM (Self-Organizing Map) algorithm to cluster analysis of high-quality development levels. The results of the study showed that there are variations in high-quality development of Beijing-Tianjin-Hebei city cluster. Beijing has the highest quality development level, followed by Tianjin and Hebei, and a significant gap exists between Beijing and Hebei in terms of the level of quality development. In addition, the high-quality development level of cities in Hebei Province are not balanced. Therefore, Beijing-Tianjin-Hebei city cluster should break down administrative barriers, making overall plans and promoting coordinated development among regions. [ABSTRACT FROM AUTHOR]