In the business department of a securities company, investors can inquire at the business department of any securities company with their ID cards during trading hours. Securities companies can query investors' account opening information through Deng Zhong company system, and investors can know their own securities account information. If the bank card bound by the investor is still in use, the third party of the bank can check the information of its securities account opening through the third party connected with the bank card. For example, the investor's securities account is bound to China Construction Bank, and the specific steps of its inquiry are as follows: log in to China Construction Bank app；; Click the investment and financial management option; In the investment and financial management interface, click the option of financial management total assets; Then click the option of Xincun Pass; Click the fund balance option; Click on the inquiry information of margin financing and securities lending, and investors can see their own securities account number, company and its account opening business department information. Securities are the general name of all kinds of economic rights and interests certificates, and also refer to specialized products, which are legal certificates used to prove that the holder enjoys certain rights and interests. Securities mainly include capital security, currency securities and commodity securities. In a narrow sense, securities mainly refer to securities products in the securities market, including property market products such as stocks, debt market products such as bonds, and derivative market products such as stock futures, options and interest rate futures. In a broad sense, securities can be divided into two categories: marketable securities and marketable securities according to whether they can bring benefits to users. Marketable securities refer to securities that cannot bring benefits to users. Including certificate securities and title securities. Voucher securities, also known as evidence securities, are documents that specifically prove certain facts, such as IOUs, receipts, tickets, etc. , generally not marketable. Ownership securities refer to securities that prove that the holder is the legal owner of a certain power, such as land ownership certificates. Securities is a kind of securities, that is, its essence is still a trading contract or contract, but it is different from other securities. It has the following characteristics: any securities have a certain face value, any securities can be freely transferred, any securities have their own prices, and any securities can bring certain benefits to their holders in the future. Securities is a kind of ownership or debt certificate with a certain face value, which proves that the holder has the right to obtain certain income on schedule and can be freely transferred and traded. Usually referred to as securities for short. The main forms are stocks and bonds. Among them, bonds can be divided into corporate bonds, national debt and real estate mortgage bonds. Securities itself has no value, just because it can bring a certain dividend or interest income to the holder, so it can be bought, sold and circulated freely in the securities market, so securities have circulation value. Classification of securities: Securities can be classified according to different standards. According to the issuer, it can be divided into government securities, financial securities and enterprise securities. According to listing or not, it can be divided into listed securities and unlisted securities;