Find public information: You can find relevant data from public information sources such as company official website, stock exchange website and financial report. If the company is a listed company, you can find company announcements, annual reports and other information on the website of the Stock Exchange. If the company is not listed, you can find the financial information provided by the company when it is registered with the industrial and commercial registration authority.

Contact the company: you can contact the company directly and ask them to provide relevant data. Usually, companies provide relevant data to investors, analysts and researchers. You can get in touch with the company through the company's official website or the contact information on the financial report.

Find the data of companies in the same industry: if you can't find the data of one company, you can find the data of other companies in the same industry as a reference. The financial data of companies in the same industry may be different, but it can provide a general concept for your comparison.

Seek professional help: If you need more accurate data or have difficulty in collecting data, you can consult professionals or companies, such as financial analysts, accountants, lawyers or consulting companies, for help and advice. They can provide advice and guidance on data collection and analysis.