Abstract: Based on the CNKI database, this study employs bibliometric methods to conduct a systematicand visual analysis of literature on the internal quality assurance systems of vocational colleges. The re-search reveals that educational quality is at the core of vocational education research, with the focus shift-ing from theoretical frameworks to practical applications and effectiveness evaluations, the changingtrends in attention to intemal quality assurance systems in vocational education, as well as the researchoutput driven by policy guidance. It reveals the distribution of academic influence across research institu-tions and their collaboration patterns, and tracks the evolution of research topics, from theoretical frame-works to policy implementation, informatization, and practical applications. The study emphasizes thecritical role of informatization in improving quality management and highlights the need for greater integra-tion of technologies such as big data and artificial intelligence in educational evaluation. The paper dis-cusses the limitations of the study and suggests future research directions, aiming to provide theoreticalsupport and ideas for improving the construction of quality assurance systems in vocational education.

Key words: vocational colleges, assurance system, internal quality, development context, research , trends, CNKI, visualization analysis