Using data of A-share listed companies for the period of 2007-2016, this paper empirically examines the effect of auditor industry specialization on the amount of contingent liabilities and the frequency of contingency information disclosed out of the table, and the adjustment effect of customer importance on the above effects. After controlling the endogenous effects such as self-selection, we find firstly that the amount of contingent information listed in the balance sheet is greater and the frequency of contingent information disclosed out of table is higher when the firms is audited by auditors with higher industry specialization. Further studies show that positive relationship between auditor industry specialization and contingency information disclosure is enhanced in more important customers.