A login information transmission method applied to a server comprising a memory and one or more processors executing a program instruction stored in the memory, and the method comprising: receiving user account number information and two-dimension code information sent from a client; verifying whether a two-dimension code scanned by the client is consistent with a two-dimension code prestored in the server, and verifying whether the server stores account number information that is the same as the user account number information received; sending a confirmation request to the client, so as to request the client to confirm an application to be logged in to if a verification result is that the two-dimension code scanned by the client is consistent with the two-dimension code prestored in the server, and the server stores the account number information that is the same as the user account number information received; and sending login confirmation information to a corresponding application server, so as to instruct the application server to notify the client to log in to the application when confirmation pass information, based on said confirmation request, sent from the client is received; receiving an application message sent from the application server; and pushing the application message to the client by using a persistent connection between the application server and the client, which comprises: storing the application message after the application message sent from the application server is received; scanning the application message stored at regular time, and determining whether there is an application message that needs to be pushed; and pushing the application message that needs to be pushed to the corresponding client by using the persistent connection. receiving user account number information and two-dimension code information sent from a client; verifying whether a two-dimension code scanned by the client is consistent with a two-dimension code prestored in the server, and verifying whether the server stores account number information that is the same as the user account number information received; sending a confirmation request to the client, so as to request the client to confirm an application to be logged in to if a verification result is that the two-dimension code scanned by the client is consistent with the two-dimension code prestored in the server, and the server stores the account number information that is the same as the user account number information received; and sending login confirmation information to a corresponding application server, so as to instruct the application server to notify the client to log in to the application when confirmation pass information, based on said confirmation request, sent from the client is received; receiving an application message sent from the application server; and pushing the application message to the client by using a persistent connection between the application server and the client, which comprises: storing the application message after the application message sent from the application server is received; scanning the application message stored at regular time, and determining whether there is an application message that needs to be pushed; and pushing the application message that needs to be pushed to the corresponding client by using the persistent connection. storing the application message after the application message sent from the application server is received; scanning the application message stored at regular time, and determining whether there is an application message that needs to be pushed; and pushing the application message that needs to be pushed to the corresponding client by using the persistent connection.