A method for modifying a blockchain network configuration, wherein a user account of a blockchain network comprises at least one administrator account, and the method comprises: obtaining, by a management client device, modification operation information, wherein the management client device is a blockchain client device of a blockchain on which the at least one administrator account is logged in as a logged-in administrator account; constructing, by the management client device, a configuration modification transaction comprising the modification operation information, and signing, as a signed configuration modification transaction, the configuration modification transaction by using the logged-in administrator account; submitting, by the management client device, the signed configuration modification transaction to the blockchain network; and after performing signature verification on the configuration modification transaction: modifying, by each node in the blockchain network based on the modification operation information comprised in the configuration modification transaction, blockchain network configuration information stored in the node, and writing, by the each node, the configuration modification transaction into the blockchain, characterized in that if the user account of the blockchain network comprises more than one administrator account, before the submitting, by the management client device, the signed configuration modification transaction to the blockchain network, the method further comprises: signing, by the management client device, the configuration modification transaction by using a key of at least one another administrator account than the logged-in administrator account. obtaining, by a management client device, modification operation information, wherein the management client device is a blockchain client device of a blockchain on which the at least one administrator account is logged in as a logged-in administrator account; constructing, by the management client device, a configuration modification transaction comprising the modification operation information, and signing, as a signed configuration modification transaction, the configuration modification transaction by using the logged-in administrator account; submitting, by the management client device, the signed configuration modification transaction to the blockchain network; and after performing signature verification on the configuration modification transaction: modifying, by each node in the blockchain network based on the modification operation information comprised in the configuration modification transaction, blockchain network configuration information stored in the node, and writing, by the each node, the configuration modification transaction into the blockchain, characterized in that if the user account of the blockchain network comprises more than one administrator account, before the submitting, by the management client device, the signed configuration modification transaction to the blockchain network, the method further comprises: signing, by the management client device, the configuration modification transaction by using a key of at least one another administrator account than the logged-in administrator account. modifying, by each node in the blockchain network based on the modification operation information comprised in the configuration modification transaction, blockchain network configuration information stored in the node, and writing, by the each node, the configuration modification transaction into the blockchain, characterized in that if the user account of the blockchain network comprises more than one administrator account, before the submitting, by the management client device, the signed configuration modification transaction to the blockchain network, the method further comprises: signing, by the management client device, the configuration modification transaction by using a key of at least one another administrator account than the logged-in administrator account.