There are many ways for enterprises to collect information. They can collect customer information by themselves, obtain customer information from public channels, or entrust professional credit reporting agencies to collect customer information. Most of the information collected by ourselves comes from the customers themselves or the institutions and personnel recommended by customers. Because customers tend to provide information that is beneficial to them and avoid information that is unfavorable to them, and the customer credit investigators of enterprises are not professionals themselves, the objectivity of the information collected is relatively poor. However, the advantage of this information source channel is that it does not need to spend extra money, and information collection can be carried out in the process of daily contact. The modern society that collects customer information through public information channels is an information society. Newspapers, magazines, radio, television, Internet and other mass media contain a lot of enterprise information. In particular, the timeliness of TV and Internet in reporting enterprise information is incomparable with other ways, and the required information can be selected more actively through the Internet. It should be noted that there are more spam and rumors on the Internet. It is best to choose well-known domestic economic websites and official websites, so that the reliability of the information collected will be greatly improved. If the customers of an enterprise are concentrated in a certain industry, the future development prospect of the customers can be predicted by subscribing to a professional publication about a certain industry. In addition, enterprises can also learn about customers' litigation records from the court and whether customers owe taxes and other customer information from the tax authorities. When collecting customer information through professional organizations, enterprises should consider their professional experience, staffing, time, professional level, service price and other factors when choosing. Choosing a reputable and rigorous credit reporting agency can improve the reliability of collected customer information and help enterprises make correct credit sales decisions. We can divide customers into three types: small customers, medium customers and large customers. The amount of transaction contracts reached between small customers and enterprises is not large, but the number does account for most of the total number of corporate customers. Bad debts of individual small customers will not bring particularly great losses to enterprises. In order to reduce the cost, in the actual operation of the enterprise, the enterprise does not conduct any credit investigation before selling credit to small customers, but begins to collect credit information of small customers after giving credit lines. The information sources selected by small customers mainly include: the commercial credit certificate provided by small customers, the internal evaluation report of front-line sales staff and the experience of dealing with customers. If a small customer who has granted credit is rescued from the list of defaulting customers soon, we should immediately recover the arrears and no longer consider providing credit sales to the customer. Medium-sized customers refer to customers whose demand for the company's goods reaches a medium level. Judging from the development stage of enterprises, most enterprises have just passed the most difficult start-up period and basically gained a firm foothold in the market. In the fierce market competition, these companies will develop in two directions, some may expand in scale, others may be disappointed in operation and fall into business crisis or financial crisis. This has a much greater impact on sales enterprises than small customers, so enterprises should pay enough attention to medium-sized customers. For medium-sized customers, credit lines cannot be allocated without any credit investigation. We should obtain the customer's standard credit report or bank credit certificate from a professional credit evaluation agency, and then decide whether to grant a credit line to medium-sized customers. In the process of dealing with medium-sized customers, the internal evaluation report of front-line sales staff and the business transaction operation with customers are also important sources of customer information. It is precisely because medium-sized customers may develop in these two opposite directions that management departments should pay more attention to collecting their information. Besides considering the cost and timeliness of information collection, they should also consider the quality, accuracy and timeliness of information. If conditions permit, they can also order credit reports from credit evaluation agencies.