On-line marking system is based on computer network technology and image processing technology, with the ultimate goal of realizing the principle of fairness and justice in examination marking. Combined with the rich experience of traditional manual marking for many years and modern high technology, the objective questions are automatically marked by computer, the subjective questions are automatically marked by different marking teachers on the computer through the network, and finally the electronic images of candidates' answer cards are automatically marked and checked by computer system.

Online marking is a conceptual revolution and the development direction of educational examination marking, which can better reflect the principle of fairness in examinations, not only solve the mistakes in subjective examination marking and marking, but also effectively evaluate the level of marking teachers. Online marking can comprehensively improve the speed and quality of marking, give a fair and correct evaluation of the quality of teaching and learning, and provide valuable analysis data, which has important guiding significance and application value for basic teaching.