On June 24, 1985 (the seventh day of the fifth lunar month), EU countries signed the Schengen Agreement to lift border travel controls. The Schengen Agreement is a document signed by some EU countries on the elimination of border travel controls. Because the agreement was signed in the border town of Schengen in Luxembourg, it is named the Schengen Agreement. The Schengen Agreement has gone through more than 10 years from its formulation to its implementation. On June 24, 1985, representatives of Germany, France, the Netherlands, Belgium and Luxembourg signed a document in Schengen to relax border travel procedures, and decided to cancel all border inspection measures between the five countries starting from January 1, 1990. However, because the agreement involved many sensitive issues, the opening of internal borders was once stalled. On June 19, 1990, the ministers of the above-mentioned five countries met again in Schengen and signed the Supplementary Protocol to the Schengen Agreement (also known as the Second Schengen Agreement), which provided specific provisions on some technical issues after the opening of internal borders. After 1990, Italy, Spain, Portugal and Greece successively joined the agreement. On April 28 this year, Austria also officially signed the accession agreement, increasing the number of signatories to the Schengen Agreement to 10. The Schengen Agreement was originally planned to be implemented on January 1, 1992. However, since the Dutch and German parliaments did not ratify the agreement, they had to postpone the entry into force until January 1, 1993, the launch date of the European Unified Market. Later, due to various reasons such as the failure to complete the information system on time, the slow approval process of various parliaments, and concerns in some countries about immigration pressure and increased crime, the entry into force of the agreement was postponed four more times. On December 22, 1994, the Executive Committee of the Schengen Agreement decided in Bonn to set March 26, 1995 as the "irreversible entry into force date" of the agreement.