This study focuses on the monitoring and safeguarding constitutional normativity in the legal system, explores its empirical Analysis in environmental protection law and patent law, and emphasizes the importance of the legal named entity identification model and legal instrument element extraction. The study adopts the implicit Markov-based legal named entity identification model and the Bleem model oriented to extracting legal instrument elements. In environmental protection law, we explored the correlation between the content and manner of law enforcement through a quantitative analysis model. We found that the correlation between pollution prevention and source prevention was 0.575, showing a strong correlation. We analyzed the R&D investment data of 23 provincial-level administrative division units in patent law from 2009 to 2023. We found that in-house R&D expenditures increased from 65% to 78.5%, proving the significant incentive effect of the patent law reforms on enterprise R&D investment. Adequate supervision and guarantee of constitutional normativity play an essential role in the improvement and practical implementation of the legal system, especially in the fields of environmental protection and intellectual property rights.