According to the relevant information, it is reliable to purchase equipment by installment in the third-class hospitals. According to the Procurement Law of People's Republic of China (PRC) and the Regulations on the Supervision and Administration of Medical Devices, when purchasing medical devices, public 3A hospitals should go through bidding, evaluation and other procedures to ensure that the purchased equipment meets the requirements of quality, safety, effectiveness and financial budget. In this process, it is necessary to pay by installments, and it is also necessary to specify the relevant clauses in the bidding documents, indicating that installment is legal.