A state transition method, applied to an access network device , wherein a relay terminal is connected to the access network device , the relay terminal is connected to at least one communication terminal , and the at least one communication terminal is connected to the access network device through the relay terminal , the method comprising: controlling the at least one communication terminal to leave a connection management connected, CM-connected, state with the access network device ; determining that each of the at least one communication terminal connected to the access network device through the relay terminal has left the CM-connected state with the access network device and sending a first control message to the relay terminal , wherein the first control message is used for instructing the relay terminal to leave a CM-connected state with the access network device ; wherein the controlling the at least one communication terminal to leave the CM-connected state with the access network device comprises one of the following: sending a wireless connection releasing message to the at least one communication terminal , wherein the wireless connection releasing message is used for instructing the at least one communication terminal to transition to a connection management idle, CM-idle, state; and sending a second wireless connection suspension message to the at least one communication terminal , wherein the second wireless connection suspension message is used for instructing the at least one communication terminal to transition to a radio resource control inactive state. controlling the at least one communication terminal to leave a connection management connected, CM-connected, state with the access network device ; determining that each of the at least one communication terminal connected to the access network device through the relay terminal has left the CM-connected state with the access network device and sending a first control message to the relay terminal , wherein the first control message is used for instructing the relay terminal to leave a CM-connected state with the access network device ; wherein the controlling the at least one communication terminal to leave the CM-connected state with the access network device comprises one of the following: sending a wireless connection releasing message to the at least one communication terminal , wherein the wireless connection releasing message is used for instructing the at least one communication terminal to transition to a connection management idle, CM-idle, state; and sending a second wireless connection suspension message to the at least one communication terminal , wherein the second wireless connection suspension message is used for instructing the at least one communication terminal to transition to a radio resource control inactive state. sending a wireless connection releasing message to the at least one communication terminal , wherein the wireless connection releasing message is used for instructing the at least one communication terminal to transition to a connection management idle, CM-idle, state; and sending a second wireless connection suspension message to the at least one communication terminal , wherein the second wireless connection suspension message is used for instructing the at least one communication terminal to transition to a radio resource control inactive state. <EOS>