Legal analysis: It is illegal to change dollars for others. It is illegal to exchange dollars privately. According to foreign exchange management regulations, residents must exchange foreign currency at banks or designated foreign exchange exchange points approved by the State Administration of Foreign Exchange, otherwise it is illegal to exchange foreign currency. If it is seized, relevant funds will be confiscated and a fine will be imposed. Individuals who illegally transfer the accumulated equivalent of more than US$ 200,000 will be investigated for criminal responsibility and can be sentenced to fixed-term imprisonment of not more than three years.

Legal basis: Article 45 of the Regulations on Foreign Exchange Control in People's Republic of China (PRC), whoever buys or sells foreign exchange privately, buys or sells foreign exchange in disguised form or illegally introduces a large amount of foreign exchange, shall be given a warning by the foreign exchange administration authorities, and his illegal income shall be confiscated, and a fine of less than 30% of the illegal amount shall be imposed; If the circumstances are serious, a fine of not less than 30% of the illegal amount but not more than the equivalent value shall be imposed; If a crime is constituted, criminal responsibility shall be investigated according to law.