高速铁路是复杂的巨系统。京津城际铁路是我国首条工程实践、运营实践的高速铁路，在攻克系统设计与系统集成、轨道高平顺与高稳定、高速列车安全与舒适、运行（营）控制可靠与高效四大方面科技难题和关键技术取得了重大创新成果；历时3年建造，开通运营验证，整体达到世界领先水平；该成果对推进我国铁路网又好又快地建设具有指导性、示范性的重大作用。

High speed railway is a complicated and enormous system. Beijing-Tianjin inter-city railway is the first high speed railway that has started commercial operation in China. There are significant innovations made on key technologies and four challenging issues including system design and integration, high track regularity and stability, high safety and riding comfort, reliable operational control and high efficiency. China Railways experienced three years to build Beijing-Tianjin inter-city railway. The operational performances of Beijing-Tianjin inter-city railway showed that the whole technology is ranking at the leading position in the world. The technologies are convincing exemplary demonstration and will be applied to build the high speed railway network in the future.