北京四环制药厂的“四环模式”周建忠由于药品专利保护在我国的实施，以仿制药为主的中国制药企业面临着严峻挑战。同时，国外著名药厂以不同形式大举进入，使我国的医药市场竞争愈演愈烈，很多药厂在发展上步履艰难。而在北京市高新技术产业开发试验区内，一个成立不足七... The “four-ring model” of Beijing Sihuan Pharmaceutical Factory Zhou Jianzhong As the pharmaceutical patent protection is implemented in China, Chinese pharmaceutical companies, which rely mainly on generic drugs, face severe challenges. At the same time, foreign well-known pharmaceutical companies have come into the market in different forms. This has made China’s pharmaceutical market increasingly competitive, and many pharmaceutical companies are struggling in development. In the experimental area of ​​high-tech industry development in Beijing, one establishment is less than seven...