Embodiments of the present specification disclose operation request allocation methods, apparatuses, and devices. One method includes: obtaining, by a server, an operation request sent by a client device for performing an operation associated with a blockchain; obtaining, by the server, attribute information of a user of the client device; determining, by the server, a node condition selected by the user based on the attribute information; determining, by the server based on the node condition, a target node from a set of nodes that have persistently connected to the server; and assigning the operation request to the target node.