The industrial Internet policies play a pivotal role in facilitating the digital transformation of China's manufacturing industry，cultivating new quality productive forces，propelling the new industrialization process，and fostering innovation-driven development. This study proposed an analysis framework and a six-step analysis process，based on Latent Dirichlet Allocation （LDA） topic modeling and Coupling Coordination Degree Model （CCDM），to examine policy diffusion and policy coordination using 348 related policies from 2015 to 2023. Fuzzy-set Qualitative Comparative Analysis （fsQCA） was employed to examine the configurations of high central-local policy coordination degree under diverse diffusion patterns. This paper found that:（1） A total of 43 policy topics were identified at the central，provincial，and municipal levels，forming a multi-pronged and integrated policy system with eight policy topic domains centered around the innovation-driven initiative and comprising network infrastructure，platform system，security guarantee，industrial application，ecosystem support，government participation，and regional development. （2） The fluctuation trends，temporal dimensions，and hierarchical features of policy topic domains composed the "time and space" characterization of policy topic domains which supported the policy diffusion pattern identification，yielding four policy diffusion patterns of China's industrial Internet policy:high-intensity resonance，peak leading，central-local complementarity，and local practice. （3） The subsystems of the policy level were basically coordinated，where the innovation-driven initiative topic domain had the highest degree of central-local coordination. The general degree of policy coordination between the industrial development goal subsystem and policy measure subsystem based on topic domains was also fundamentally coordinated which was especially higher at the municipal level. （4） High policy power and minimal vertical pressure differentials constituted the core conditions for the majority of configurations demonstrating superior central-local coordination，while economic endowments and horizontal spillover effects exhibited context-dependent complementary relationships. This study contributes to the methodological and theoretical enrichment of studying policy diffusion and coordination within the policy system. It effectively analyzes the dynamic process and collaborative mechanisms of establishing the policy system composed of texts in multi-level governments. It is characterized by objectivity，efficiency，explanatory power，and strong applicability. This study also clarifies the key areas and significant directions of China's industrial Internet policy and its evolutionary context，and will provide an overall scan for improving the industrial Internet policy system and promoting digital industry innovation and high-quality industrial development.