1, the scope of implementation is different, collective procurement is the centralized procurement of hospitals in all provinces, while 4+7 is the procurement of public medical institutions in four municipalities directly under the central government, namely Beijing, Tianjin, Shanghai and Chongqing, and seven cities, namely Shenyang, Dalian, Xiamen, Guangzhou, Shenzhen, Chengdu and Xi'an.
2, the implementation of different methods, centralized procurement is the hospital in the procurement of drugs, can not directly contact with pharmaceutical companies, by professional organizations unified to the drug manufacturers bidding price. And 4 + 7 is a unified procurement platform by the official, public medical institutions to report the demand for drugs, the winning drug companies to public medical institutions to sell drugs.