A method for detecting a Universal Mobile Telecommunications System, UMTS, terminal, characterized by comprising: composing a Transaction Detail Record, TDR, of a Radio Access Network Application Part, RANAP, at a Packet Switch, PS, domain interface and at a Circuit Switch, CS, domain interface; acquiring an International Mobile Subscriber Identity, IMSI, and an International Mobile Equipment Identity, IMEI, from the TDR, and establishing a corresponding relation between the IMSI and the IMEI; analyzing and obtaining operation information of terminal corresponding to each IMEI according to the TDR, and determining the IMEI of an abnormal terminal according to the operation information obtained by analyzing; and determining an IMSI code used by the abnormal terminal according to the corresponding relation between the IMEI and the IMSI; wherein the operation information comprises at least one of an overclock operation, a super-long delay operation and an operation success rate; wherein the process of analyzing and obtaining the operation information of terminal corresponding to each IMEI according to the TDR comprises at least one of the following steps of: counting the operation times of each event of any terminal according to the TDR, and determining that the terminal has performed the overclock operation when the operation times of at least one event exceed a preset threshold; counting the operation delay of each event of the terminal according to the TDR, and determining that the terminal has performed the super-long delay operation when the delay of at least one event exceeds a preset threshold; and counting the operation success rate of each event of the terminal according to the TDR, and determining that the operation success rate of the terminal is low when the operation success rate of at least one event is lower than a preset threshold. composing a Transaction Detail Record, TDR, of a Radio Access Network Application Part, RANAP, at a Packet Switch, PS, domain interface and at a Circuit Switch, CS, domain interface; acquiring an International Mobile Subscriber Identity, IMSI, and an International Mobile Equipment Identity, IMEI, from the TDR, and establishing a corresponding relation between the IMSI and the IMEI; analyzing and obtaining operation information of terminal corresponding to each IMEI according to the TDR, and determining the IMEI of an abnormal terminal according to the operation information obtained by analyzing; and determining an IMSI code used by the abnormal terminal according to the corresponding relation between the IMEI and the IMSI; wherein the operation information comprises at least one of an overclock operation, a super-long delay operation and an operation success rate; wherein the process of analyzing and obtaining the operation information of terminal corresponding to each IMEI according to the TDR comprises at least one of the following steps of: counting the operation times of each event of any terminal according to the TDR, and determining that the terminal has performed the overclock operation when the operation times of at least one event exceed a preset threshold; counting the operation delay of each event of the terminal according to the TDR, and determining that the terminal has performed the super-long delay operation when the delay of at least one event exceeds a preset threshold; and counting the operation success rate of each event of the terminal according to the TDR, and determining that the operation success rate of the terminal is low when the operation success rate of at least one event is lower than a preset threshold. counting the operation times of each event of any terminal according to the TDR, and determining that the terminal has performed the overclock operation when the operation times of at least one event exceed a preset threshold; counting the operation delay of each event of the terminal according to the TDR, and determining that the terminal has performed the super-long delay operation when the delay of at least one event exceeds a preset threshold; and counting the operation success rate of each event of the terminal according to the TDR, and determining that the operation success rate of the terminal is low when the operation success rate of at least one event is lower than a preset threshold.