The invoice code is composed of 12 digits. Invoice code is the unique code of invoice by China tax department, each invoice code is different and unique, the first 10 digits of invoice code is the code of tax authority, the last two digits is the code of invoice type, invoice code and invoice number is the important basis to verify the authenticity of invoices, in China, you can use the official website of the State Administration of Taxation or the related cell phone application software to input the invoice code and the In China, you can enter the invoice code and invoice number through the official website of the State Administration of Taxation or the relevant mobile application software, and if the query result is consistent with the invoice information in your hand, then the invoice is a genuine invoice.