The invention discloses a dual-mode system type network switching method and system. A dual-mode module sends a number writing instruction to an operator management platform; the operator management platform sends contact signing data to a remote management platform; the remote management platform receives the contact signing data and sends an execution instruction to an embedded eSIM card; the embedded eSIM card acquires the card information of the eSIM card from a card manufacturer and acquires the contact signing data from the remote management platform according to the execution instruction, carries out writing in of a second card number based on the contact signing data, and sends the card information and the contact signing data to the dual-mode module; and the dual-mode module sendsthe card information and the contact signing data to the operator management platform for activation and establishes connection with a second mode network through the second card number after activation completion of the card information and the contact signing data. Therefore, when network switching is needed, the network of the dual-mode module can be connected to a re-writing-in network automatically, thereby completing network switching.