A Trusted Execution Environment, TEE, initialization method, for a system comprising a mobile terminal provided with a TEE, the method comprising: acquiring, by the mobile terminal, from a Subscriber Identity Module, SIM, card installed in the mobile terminal an operator identifier preset in the SIM card; characterized in that the system comprises a Trusted Service Management, TSM, platform, and in that in the TEE a list of operator identifiers is preset, the method further comprising the steps of: inquiring, by the mobile terminal, the list of operator identifiers to determine whether or not there is an operator identifier identical to the operator identifier acquired from the SIM card; in the case that there is an operator identifier identical to the operator identifier acquired from the SIM card, acquiring, by the mobile terminal, a public key corresponding to the operator identifier from the SIM card, binding the public key to the operator corresponding to the operator identifier, and activating the key; and authenticating, by the mobile terminal, the TSM platform with the public key; and in the case that the TSM platform has been authenticated successfully, completing, by the mobile terminal, loading processing on the TEE and downloading a management key of the TEE from the TSM platform, so as to execute the application management and/or secure operation through the TEE. acquiring, by the mobile terminal, from a Subscriber Identity Module, SIM, card installed in the mobile terminal an operator identifier preset in the SIM card; characterized in that the system comprises a Trusted Service Management, TSM, platform, and in that in the TEE a list of operator identifiers is preset, the method further comprising the steps of: inquiring, by the mobile terminal, the list of operator identifiers to determine whether or not there is an operator identifier identical to the operator identifier acquired from the SIM card; in the case that there is an operator identifier identical to the operator identifier acquired from the SIM card, acquiring, by the mobile terminal, a public key corresponding to the operator identifier from the SIM card, binding the public key to the operator corresponding to the operator identifier, and activating the key; and authenticating, by the mobile terminal, the TSM platform with the public key; and inquiring, by the mobile terminal, the list of operator identifiers to determine whether or not there is an operator identifier identical to the operator identifier acquired from the SIM card; in the case that there is an operator identifier identical to the operator identifier acquired from the SIM card, acquiring, by the mobile terminal, a public key corresponding to the operator identifier from the SIM card, binding the public key to the operator corresponding to the operator identifier, and activating the key; and authenticating, by the mobile terminal, the TSM platform with the public key; and in the case that the TSM platform has been authenticated successfully, completing, by the mobile terminal, loading processing on the TEE and downloading a management key of the TEE from the TSM platform, so as to execute the application management and/or secure operation through the TEE.