In Vietnam, along with economic growth, urbanization is taking place rapidly, causing pressure to provide housing for urban residents, especially those with low income. This study analyzes the factors affecting access to credit to buy social housing of low-income people in Hanoi city. The study uses data from a survey of 500 people who have participated in social housing programs and a regression model based on Heckman's theory and empirical model of people's access to credit. The results show that variables including age, gender, income, marital status, access to informal credit are significant factors affecting the ability to access formal credit and loan amount. From credit institutions to buy social housing for low-income people in Hanoi. The study also discusses social housing purchase policies in Vietnam and suggests implications for increasing low-income people's access to credit sources to purchase social housing.