The invention discloses a double-point synthesizer, and aims to achieve the goal that the telemechanical apparatus does not lose the clear state of the switch or transmit excessive transient intermediate state when synthesizing a double-point signal. The synthesizer is provided with a real-time data processing module, a real-time data base and a double-point synthesizing module, wherein a change event processing module is arranged between the real-time data processing module and the double-point synthesizing module; a change event queue arranged in the change event processing module stores a dynamic process of switch nodes change as a change event record; and the double-point synthesizing modules extracts the change event record in the change event queue to synthesize a dynamic position signal of the switch. Compared with the prior art, the real-time data processing module in the invention detects the real-time state of the signal, updates the static signal condition in the real-time data base when the signal changes, adds the changed signal dynamic state to the change event processing module; and the double-point synthesizing module synthesizes the change dynamic signal in the extraction process. The invention has the advantages of no loss and no excessive transmission.