On the basis of careful investigation for the frequency-domain interference, a new technology named pulse frequency-domain interferometry is illustrated. By means of the new technology, the pump pulse and probe pulse can arrive at the measured target synchronously in the pump-probe experiments. The time resolution of frequency-domain interferometry is more than the pulse period. The work principle and system structure are illustrated in detail. After simulating the output signal of frequency-domain interferometry in theory, it comes to a conclusion that the pump pulse and probe pulse have arrived at measured target synchronously when only one output stripe appears in frequency-domain interferometry. Further dynamic experiments draw the same result as is shown in theoretic simulation.