關鍵詞：起重機；結構設計；起升機構；行走機構；
Abstract
Gantry crane is important lifting equipment and widely used in mines, railway stations, ports, power plants and manufacturing fields.They play an important role in the development of the society and their possible applications are expanding over the years. Domestic manufaeturers in their respeetive areas expand produet range and optimize Product Performanee，by introducting advaneed teehnology to develop their own Products or the foreign advanced teehnology to improve Product quality.
Firstly，the background and significance of this research were introdueed，and the development and the structural classification of the gantry crane are diseussed briefly in the paper,The 450t-38m gantry crane was designed with its basic Parameters;The static load，dynamic load，wind load，horizontal side force，collision force were computed，and stability and safty cheeked.The metal structure of gantry was designed and calculates.hoisting mechanism and walking mechanism of the car were designed and calculates; walking mechanism of the cart was designed and calculates,
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