Legal analysis: If the restaurant owes money, it can negotiate first and ask the other party to repay it. If no agreement is reached through consultation, you can collect evidence such as IOUs, write a complaint and bring a lawsuit in court. First, prepare three complaints and submit the identity information of the original defendant. If this restaurant is an individual industrial and commercial household, it also needs to provide the owner's ID number. Then submit evidence of the amount of payment. Submit it to the court where the defendant is located for acceptance, and pay the acceptance fee in 51 yuan in advance.

legal basis: article 118 of the civil code of the people's Republic of China enjoys creditor's rights according to law. Creditor's right is the right of the obligee to request a specific obligor to do or not do a certain act because of contract, tort, negotiorum gestio, unjust enrichment and other provisions of the law.