In fact, house purchase expenditure is one of the most important expenditures in residents' life. Therefore, residents will widely collect relevant information and conduct multi-party comparison before decision-making. Compared with the prosperous market demand and market transactions, the channels for users to obtain the detailed information of the urban second-hand housing market are relatively single. Generally, they obtain information through real estate intermediaries or house purchase websites. These information are basically the text introduction of several houses. Distribution based on real estate geographyDue to the dispersion and multidimensional nature of housing information, it is difficult for users to grasp the overall situation of the urban second-hand housing market as a whole, and it is more difficult to obtain historical transaction information, so as to understand the time evolution of the transaction situation. At present, a large number of urban second-hand housing transaction data have been accumulated on the purchase website. These data record a lot of information such as the total price, unit price, geographical location, area, transaction cycle and trading volume of second-hand housing transactions. These information reveals the development and time evolution of urban second-hand housing transaction market, which is of great significance to users' market decision-making. As a way of data analysis, visualization can help users effectively and intuitively understand the information behind the data through visual coding and visual graphic display of mining data. In view of the large number and high dimensionality of specific urban second-hand housing transaction data, visual analysis and display is particularly important. Therefore, how to use visualization technology to mine and explore the information behind a large number of urban second-hand housing transaction data and help users expand their knowledge and make relevant decisions is a new and important research topic.