The Regulations of Beijing on Optimizing the Business Environment has made many innovations in the aspects of administrative examination and approval，market environment，government services，supervision and law enforcement，but there is still room for improvement compared with the regulations of other provinces and cities. In the practice of optimizing the business environment，Beijing has implemented a series of innovative measures，but at the same time，Beijing is also facing many challenges. The third-party assessment is an important window to observe the business environment of the city. The outstanding achievements of Beijing in different assessments show its institutional advantages and governance efficiency. At the same time，the assessment also exposes the weak points，such as financing difficulties，high tax rate，and how to improve the natural and living environment，how to strengthen the integrity of the government. In order to further improve the business environment，Beijing should introduce the third-party assessment to strengthen the social supervision of the implementation of the regulations；expand the scope of government purchasing services；improve the efficiency，quality and standards of government services；make the law enforcement environment combining leniency with severity；and further strengthen the integrity of government departments.