A method for implementing real time data service wherein, after a user terminal accesses a real time data service system by adopting a pre-shared key-based way of authentication and key management, the method comprises and is characterised by: verifying the user terminal by access point, AP, when an AP of the real time data service system starts to forward data messages of the real time data service to the user terminal, continuing (Step 213) forwarding the data messages of the real time data service to the user terminal after the verification is successful, and stopping forwarding (Step 212) the data messages of the real time data service to the user terminal when the verification is failed, wherein the process of verification comprises: the AP sends (Step 207) a signature verification request to the user terminal; after receiving the signature verification request, the user terminal generates (Step 208) a signature value by using a private key corresponding to a wireless local area network authentication and privacy infrastructur, WAPI, certificate of the user terminal, and sends (Step 208) the signature value comprised in a signature verification response to the AP; and the AP decrypts (Step 211a) the received signature value by using a public key corresponding to the WAPI certificate, contrasts (Step 211b) the consistency of the decrypted value and data to be signed, determines that the verification is successful when the contrast result is that the decrypted value and the data to be signed are consistent, and determines that the verification is failed when the contrast result is that the decrypted value and the data to be signed are not consistent. verifying the user terminal by access point, AP, when an AP of the real time data service system starts to forward data messages of the real time data service to the user terminal, continuing (Step 213) forwarding the data messages of the real time data service to the user terminal after the verification is successful, and stopping forwarding (Step 212) the data messages of the real time data service to the user terminal when the verification is failed, wherein the process of verification comprises: the AP sends (Step 207) a signature verification request to the user terminal; after receiving the signature verification request, the user terminal generates (Step 208) a signature value by using a private key corresponding to a wireless local area network authentication and privacy infrastructur, WAPI, certificate of the user terminal, and sends (Step 208) the signature value comprised in a signature verification response to the AP; and the AP decrypts (Step 211a) the received signature value by using a public key corresponding to the WAPI certificate, contrasts (Step 211b) the consistency of the decrypted value and data to be signed, determines that the verification is successful when the contrast result is that the decrypted value and the data to be signed are consistent, and determines that the verification is failed when the contrast result is that the decrypted value and the data to be signed are not consistent. the AP sends (Step 207) a signature verification request to the user terminal; after receiving the signature verification request, the user terminal generates (Step 208) a signature value by using a private key corresponding to a wireless local area network authentication and privacy infrastructur, WAPI, certificate of the user terminal, and sends (Step 208) the signature value comprised in a signature verification response to the AP; and the AP decrypts (Step 211a) the received signature value by using a public key corresponding to the WAPI certificate, contrasts (Step 211b) the consistency of the decrypted value and data to be signed, determines that the verification is successful when the contrast result is that the decrypted value and the data to be signed are consistent, and determines that the verification is failed when the contrast result is that the decrypted value and the data to be signed are not consistent.