In the article, the author has pointed out the current situation and the urgent needs for planning, use of underground space in Hanoi city. Through analysis, the paper offers some ideas for planning and use of underground space in Hanoi to be effective namely: electricity, water pipe system will be put into the tunnel technique of synthesis of underground transportation system in Hanoi include: street subway, autonobile tunnels, road tunnels, space system, infrastructure underground. Thereby, the authors assert planning and use of urban underground space in a synchronous manner with the vision system is one effective solution solved problems such as traffic congession, demand for car parking, flood situation and efficient use of land fund of the city underground.