Abstract: Air law has social function, economic function, political function, interest regulation function and incentive function of the general function of the law. They are different from general legal function of the specific connotation because of the particularity of the adjustment object. Air law in adjusting aviation activities should achieve social effect, including maintaining the order of aviation, promoting the development of the aviation industry, resolving disputes between the subjects of aviation legal relations. The development of air law serves the country's political needs, so as to control air power, configure aviation resources and regulate the political behavior in aviation. Air Law can provide a code of conduct for the safety and orderly operation of the aviation market. Due to the scarcity of aviation resources, it needs to regulate the interests by air law in order to achieve the interest expression, balance and reorganization of aviation subjects. The performance of incentive function by air law is to develop air transportation and friendly relations between the countries. If air law is legislated, changed, abolished and released, it should be based on the ability of the air law to deal with the individual or the society.