As the main developing form of the net economy,E-commerce is attracting more and more clients with its inexpensive price and the fancy experience.And the domestic E-commerce enterprises have been always puzzled by the crisis of confidence brought about by the security of the electronic payment under B-C mode and the time lag of the payment in kind.The lower fraction surviving of numerous net stores represents clearly the difficult position faced by E-commerce.Taking the net store under B-C mode as the cutting-in point,this paper analyzes on the opportunities and challenges faced by domestic E-commerce.