Yes, the Civil Aviation Fund refers to the China Civil Aviation Industry Development Fund, which was established by the national finance department to support and develop China's civil aviation industry. According to the relevant laws and regulations, when purchasing air tickets, it is necessary to pay the civil aviation fund to support the development of civil aviation and improve passenger service. Therefore, when purchasing air tickets, water charges and other expenses need to be deducted from the civil aviation fund to comply with the relevant laws and regulations.