Design and Implementation of Train Tickets Online Booking System Abstract:This system uses Visual Studio 2005 and SQL Server 2005 and three layers architecture technology developing Train Tickets Online Booking System.The main function of this system is:the login of user and administrator ,the user module mainly realizes train ticket inquires,reservations,refundment functions and the administrator module mainly realizes the user information management functions and order information management function.The system has more clear interface,inquire speed more quickly and system database more safety features than the exsiting system. Key Words:Train tickets;Booking on Internet;Three layers architecture