Legal analysis: When the debtor in arrears is serving his sentence in prison, he can sue in the grass-roots court where the prison is located, demanding payment of the arrears, and the accepting court will take the defendant to the prison for trial. Those who owe money to jail can also be repaid by the debtor's close relatives instead. According to relevant laws and regulations, if both parties are imprisoned or compulsory education measures are taken, they shall be under the jurisdiction of the people's court of the defendant's original residence. The lender may urge the borrower to return it within a reasonable period of time.

Legal basis: Article 675 of the Civil Code of People's Republic of China (PRC) stipulates that the borrower shall repay the loan within the agreed time limit. If the term of the loan is not agreed or clearly agreed, and cannot be determined according to the provisions of Article 510 of this Law, the borrower may return it at any time; The lender may urge the borrower to return it within a reasonable period of time.