According to the inquiry of China Travel Service. Com, according to Article 225 of the Criminal Law, "violation of state regulations" is a necessary condition for the crime of illegal business operation. To judge whether an act is illegal, we must first make an accurate judgment on the illegality of the act. According to the provisions of the Negotiable Instruments Law, a negotiable instrument is a document of rights that can be transferred according to law. The act of buying and selling bank acceptance bills and bill agency discount implemented by bill intermediaries is essentially a paid transfer of bill rights, but there are no laws and state regulations prohibiting such acts at present. According to the basic principle of negotiable instruments law, the life of negotiable instruments lies in circulation, and the more negotiable instruments are endorsed, the higher their credit will be. Negotiable Instruments Law encourages the transfer and circulation of negotiable instruments, and does not stipulate that negotiable instruments are one-time payment tools, so it is not appropriate to make a negative legal evaluation of negotiable instruments transfer. Laws and regulations related to bank acceptance bills mainly regulate the behavior of issuing tickets, bank acceptance and bank discount in banking business, but there are no restrictions on the intermediate links of bill circulation.