With the continuous development of information technology, the traditional business model can no longer meet the needs of modern society. Therefore, e-commerce based on computer network technology emerged as the times require. E-commerce is a new business activity mode under the modern social environment. The formation and development of e-commerce has greatly promoted the development and progress of modern society, and at the same time played a very large role in the development of the world economy. It can be said that in the current social and economic environment, e-commerce occupies a pivotal position and is an important factor that cannot be ignored in the process of international trade development and construction. This article mainly explains e-commerce at first, and introduces its characteristics, classification and advantages; then summarizes the current three application fields of e-commerce and puts forward the current problems faced by global e-commerce, and combines the actual situation, puts forward Scientific and reasonable suggestions play an active role in promoting the stable development of e-commerce and international trade.