The aim of this study is to present the solutions for enhancing the usage of urban spaces at night based on principles of twenty-four hour cities. Urban space is essentially built for use by human beings in their lifespan; it has gone through many changes due to the influences of modern trends. One main point needing reconsideration is urban spaces and their usage in different times especially in day and night. Now what is the main problem that most urban spaces are not able to provide their expected service in different times and are less used? Data collection procedure is a combination of library methods and field studies. Data taken from diagnostic interviews was analyzed using descriptive-analytical techniques. Comparison of case study of night and day usage and identification of challenges for nightly usage of urban spaces will be introduction to providing required strategies and solutions. Such strategies will be effective and useful in transforming Iranian cities especially Tehran to a twenty-four hour city.