Professional titles required a high-quality article to be written. In order to avoid plagiarism and other inappropriate behaviors, some professional duplicate checking systems could be used to check whether the article had plagiarism and other inappropriate behaviors. The following are a few commonly used duplicate checking systems: 1Turnitin: This is one of the most widely used duplicate checking systems. It can detect plagiarism, repetition, citations, and other inappropriate behaviors in the text and provide detailed reports. The system supports multiple languages and file format, suitable for multiple fields and industries. 2. In addition to powerful text editing functions, Flammarly also provides some duplicate checking tools that can detect plagiarism, repetition, citations and other inappropriate behaviors in the text and provide detailed reports. The system supports multiple languages and file format, suitable for multiple fields and industries. Plagscan: This is another professional duplicate checking system that can detect plagiarism, repetition, citations, and other inappropriate behaviors in the text and provide detailed reports. The system was suitable for checking all kinds of documents and texts, especially academic papers and business documents. All three systems were professional duplicate checking systems that could check if there was any plagiarism or other inappropriate behavior in the article and provide detailed reports. When choosing the duplicate checking system, you can choose the appropriate system according to your specific needs and circumstances.