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The characteristics of digital economy show that in the stage of knowledge innovation, the wider the scope of knowledge application and the more customers involved, the more value can be created. In the stage of knowledge popularization and imitation, due to the timeliness problem, the knowledge of developed countries declined in marginal return. In developing countries, it can maintain a high marginal income.
Because for developing countries, this knowledge is still the latest and most time-valuable. Information technology has been in the stage of popularization and imitation since it entered 2 1 century. Spreading to developing countries conforms to the highest interests of developed countries and can greatly improve the speed of informatization in developing countries.