The original intention of the online question answering service is to better let students understand and master the knowledge they have learned, and apply it to the examination to obtain satisfactory results. We found that many students did not fully understand the homework after class, the examination points and the course courseware taught by the professors, and the course knowledge points could not be fully mastered. The essential reason is that there is no concept of a systematic knowledge system, and the learning of each knowledge point is scattered and cannot be comprehended. 1v1 online question answering service can solve this problem well. Before each student receives the service, the pre-sales customer service will understand the needs of the students in detail, whether they need to make a breakthrough before the examination, or analyze the knowledge points every week, or answer the wrong questions in the homework and examination.