信息服务活动过程是一个知识扩大再生产的过程。信息和知识的经济属性决定了这项社会活动必然要受到成本与收益效应的影响。信息服务成本与收益原则的存在 ,是促进信息服务存在和发展的内在动力 ,同时也是信息服务机制与模式选择必然的经济学理由。对信息服务成本与收益原理的进一步研究 ,将会对信息服务理论与实践发展具有重要的指导意义。 The process of information service activities is a process of expanding reproduction of knowledge. The economic nature of information and knowledge determines that this social activity is bound to be affected by the effects of costs and benefits. The existence of information service cost and income principle is the intrinsic motivation to promote the existence and development of information service and also the inevitable economic justification of information service mechanism and mode choice. Further research on the principle of information service cost and income will have important guiding significance for the development of information service theory and practice.