国际惯例是处理国际间经济往来业务的习惯做法。世界上存在不同的政治社会制度和不同的法律制度,各国的经济发展水平也大相径庭,这必然会妨碍国际间的经济交往,不利于国际间的合作和交流,于是一些国际组织在平等互利的基础上发起签订了一些双边条约和国际公约,经过长期的实践、积累,逐步形成了被多数国家公认和通用的成文和不成文 International practice is a common practice in dealing with international economic transactions. There are different political and social systems and different legal systems in the world. The level of economic development of countries varies greatly. This will inevitably hinder international economic exchanges and be detrimental to international cooperation and exchanges. Therefore, some international organizations are based on equality and mutual benefit. Initiating the signing of a number of bilateral treaties and international conventions, and through long-term practice and accumulation, it gradually formed literary and unwritten documents that were recognized and used by most countries.