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This paper systematically explores the core concepts, validation tools, and implementation methods for PDF/A compliance testing. It begins by introducing the basic requirements of the PDF/A standard and the importance of compliance verification, then provides a detailed analysis of mainstream solutions such as VeraPDF, online validation tools, and third-party reports. Finally, it discusses the application scenarios of supplementary tools like DROID and JHOVE. Code examples demonstrate automated validation processes, offering a complete PDF/A testing framework for software developers.