A method for implementing short-messaging between multiple enterprises, comprising: receiving, by a short messaging, SM, server of the enterprise to which a sender belongs, a short message sent by the sender to a receiver's number; adding, by the SM server, an uniform short messaging, SM, access code anterior to number of the sender in the short message, and sending, by the SM server, the short message having the uniform SM access code to a short message gateway, SM GW, so as to send the short message to a mobile terminal corresponding to the receiver's number; sending, by the SM server, the short message to a PC client corresponding to the receiver's number; wherein the method further comprising: receiving, by the SM GW, a short message sent by the mobile terminal to the number of the sender, the uniform SM access code being carried anterior to the number of the sender in the short message; sending, by the SM GW, the short message to a message distribution server; and eliminating the uniform SM access code and then sending the short message to the SM server to which the PC client corresponding to the number of the sender belongs, by the message distribution server; characterized in that the step of sending, by the SM server, the short message to the PC client corresponding to the receiver's number comprises: judging (502, 603), by the SM server, whether the SM server is in charge of the SM service of the receiver's number; if the result of the judgment is "Yes", sending, by the SM server, the short message to the PC client corresponding to the receiver's number, otherwise forwarding, by the SM server, the short message to a message distribution server, so that the message distribution server sends the short message to the PC client corresponding to the receiver's number. receiving, by a short messaging, SM, server of the enterprise to which a sender belongs, a short message sent by the sender to a receiver's number; adding, by the SM server, an uniform short messaging, SM, access code anterior to number of the sender in the short message, and sending, by the SM server, the short message having the uniform SM access code to a short message gateway, SM GW, so as to send the short message to a mobile terminal corresponding to the receiver's number; sending, by the SM server, the short message to a PC client corresponding to the receiver's number; wherein the method further comprising: receiving, by the SM GW, a short message sent by the mobile terminal to the number of the sender, the uniform SM access code being carried anterior to the number of the sender in the short message; sending, by the SM GW, the short message to a message distribution server; and eliminating the uniform SM access code and then sending the short message to the SM server to which the PC client corresponding to the number of the sender belongs, by the message distribution server; characterized in that the step of sending, by the SM server, the short message to the PC client corresponding to the receiver's number comprises: judging (502, 603), by the SM server, whether the SM server is in charge of the SM service of the receiver's number; if the result of the judgment is "Yes", sending, by the SM server, the short message to the PC client corresponding to the receiver's number, otherwise forwarding, by the SM server, the short message to a message distribution server, so that the message distribution server sends the short message to the PC client corresponding to the receiver's number. receiving, by the SM GW, a short message sent by the mobile terminal to the number of the sender, the uniform SM access code being carried anterior to the number of the sender in the short message; sending, by the SM GW, the short message to a message distribution server; and eliminating the uniform SM access code and then sending the short message to the SM server to which the PC client corresponding to the number of the sender belongs, by the message distribution server; characterized in that the step of sending, by the SM server, the short message to the PC client corresponding to the receiver's number comprises: judging (502, 603), by the SM server, whether the SM server is in charge of the SM service of the receiver's number; if the result of the judgment is "Yes", sending, by the SM server, the short message to the PC client corresponding to the receiver's number, otherwise forwarding, by the SM server, the short message to a message distribution server, so that the message distribution server sends the short message to the PC client corresponding to the receiver's number. judging (502, 603), by the SM server, whether the SM server is in charge of the SM service of the receiver's number; if the result of the judgment is "Yes", sending, by the SM server, the short message to the PC client corresponding to the receiver's number, otherwise forwarding, by the SM server, the short message to a message distribution server, so that the message distribution server sends the short message to the PC client corresponding to the receiver's number.