Consumer groups demand has characters of fuzziness, aggregation, personality, centrality about interactive communication topic, sharing ideas and experience of the initiative, with which the consumer behavior in virtual group buying model-IEDGS emerged then. Some problems, such as online transaction security, group purchase service enterprises and business reputation, after-sales service system, legal and regulatory have been the main obstacles of virtual group buying. In order to ensure the normal consumer behavior in virtual group buying, we need to strengthen the security of online trading, heighten the reputation of group purchase enterprises and business, improve after-sales service and perfect the legal system of supervision.