Abstract: [Abstract]　 Online knowledge payment has achieved explosive growth in 2016. After experiencing repeated trials in the market， it has presented a unique development logic and operational trajectory. But at the same time， there are also many problems， and it is urgent to find the path of sustainable development. This paper attempts to deeply excavate the ideas and methods of sustainable development of online knowledge payment from four aspects ： content， platform， social interaction and service. This online knowledge payment model embecldecl with above four aspects forms a strong complement to traditional education， media and publishing industries， and points out the direction for the sustainable development of online knowledge payment.