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With the development of science and technology and the increasing demand of people, data warehouse technology has been gradually adopted by banks. Data warehouse project has the features of greater risk, longer investment period and instability. Therefore, it is necessary to plan well before investing to avoid blind investment. From the perspectives of interpretation of the definition of data warehouse project of commercial bank, investment return features of data warehouse project of commercial bank and qualitative and quantitative analysis of investment return of data warehouse project of commercial bank, the paper discusses the data warehouse project of commercial bank. 1. Interpretation of Data Warehouse Project of Commercial Bank Data warehouse is the structure data environment of decision support system and analysis data source. It refers to the data set which can support the management decision process and face the theme, with the integration, stability and time change. The data warehouse system of the bank should first import the data from txt document into the source database, then transfer the data to the data warehouse, and then have the online analysis tool and data mining tool to carry out the statistical analysis and prediction function, so as to realize the function of supporting decision. The customer can query the information by the relationship between the dimension table and the corresponding fact table. The data mining algorithm can be used to extract the information, so as to predict the trend of the bank. At the same time, the customer's repayment ability and debt ability can be analyzed according to the known data. 2. Analysis of Investment Return Features of Data Warehouse Project of Commercial Bank The data warehouse project of commercial bank has the characteristics of long-term, risk, instability and complexity. The analysis of the return characteristics of the commercial bank's data warehouse project cannot be only a simple profit and cost reduction. We should consider in the long run the combination of macro and micro factors and take full account of possible risks. 2.1 Long-term Development Planning of Investment Return of Data Warehouse Project of Commercial Bank. The data warehouse is one of the most complex parts of the banking system. It integrates all the banking services, including a large number of bank data including customer's business information and other basic information, such as the ability to repay the debt. So the commercial bank data warehouse, as one of the main parts, will support the whole bank information department. The operation of the system helps the system to deal with the complex business and analyze it. With the change of business needs, the system can adjust and change its own time to meet the many needs of the customer. In the process of the continuous development of commercial bank data warehouse projects, the relationship between cost and income will inevitably change, which requires commercial banks to make a long-term plan for the bank data warehouse project, compare the annual bank data, and prepare the work before doing good things. As a result, the long-term goals and interests of the data warehouse project are put in the first place. We can not only pay attention to the small interests of 109 2018 4th International Conference on Economics, Management and Humanities Science(ECOMHS 2018) Copyright © (2018) Francis Academic Press, UK the eyes and proceed from these aspects to analyze the investment returns of the commercial bank's data warehouse projects. Table 1. Different Loan amount from 2014 to 2017 Types of loans Loan amount of 2014 Loan amount of 2015 Loan amount of 2016 Loan amount of 2017 Car loan 98 61 56 55 Comprehensive consumer loan 55 8 91 98 Personal pledge loan 15 61 4 76 Micro Credit Loan for short term 85 87 82 92 Personal housing loan 750000

Brief Analysis on Investment Return of Data Warehouse Project of Commercial Bank