Once Tehran was an enchanting city garden with abundant green lands at Alborz mountain range. Now it has changed into a metropolis with many problems as a result of losing a lot of gardens, farms, and green spaces. Tehran is the capital of Iran with a population around 13 million people daytime and 8.5 million people night-time. Its area is about 730 square kilometres and in terms of population density, it is ranked 25th in the list of most populous cities. Due to the lack of public spaces required, Tehran metropolis has faced serious challenges to create a sense of life satisfaction in the residents. Due to population density and numerous amount of mass housing and high land prices, the development of public spaces required by the city has become more difficult. Therefore, one of the ways to develop such spaces is to use underground surfaces and combine them with existing surfaces on the ground. How to properly correlate and interact between the development of urban public spaces, urban underground spaces and improving Tehran metropolis citizens’ quality of life and provide solutions for it, is the main issue of this research.

德黑兰曾经是一座迷人的城市花园，在厄尔布尔士山脉拥有丰富的绿地。现在，由于失去了许多花园、农场和绿地，它变成了一个有许多问题的大都市。德黑兰是伊朗的首都，白天人口约 1300 万人，夜间人口约 850 万人。面积约730平方公里，人口密度在全球人口最多城市中排名第25位。由于缺乏所需的公共空间，德黑兰大都市在为居民创造生活满足感方面面临着严峻挑战。由于人口密集和大量的群众住房和高地价，城市所需的公共空间的开发变得更加困难。所以，开发此类空间的方法之一是使用地下表面并将它们与地面上的现有表面结合起来。如何在城市公共空间、城市地下空间的发展与提高德黑兰大都市市民的生活质量之间进行适当的关联和互动，并为此提供解决方案，是本研究的主要问题。