Fund securities companies, involving trading positions and their own research positions, as well as fund managers, need to hand in their mobile phones at the opening.

Bond is a kind of financial contract, which is a creditor's right and debt certificate issued to investors when the government, financial institutions and industrial and commercial enterprises directly borrow money from the society and promise to pay interest at a certain interest rate and repay the principal according to the agreed conditions. The essence of bonds is the proof of debts, which has legal effect. There is a creditor-debtor relationship between bond buyers or investors and issuers. Bond issuers are debtors and investors (bond buyers) are creditors.