Abstract: In order to improve the phase measurement sensitivity of photonic optical interferometers in photon loss scenarios, a theoretical study of the sensitivity of photon coincidence measurement under photon loss has been carried out using a typical twin-Fock state as an input of a photonic Mach-Zehnder interferometer. Compared to parity measurement, the analysis shows that the photon coincidence measurement scheme is more robust to photon loss when using photon pairs as input, and the phase measurement sensitivity based on photon coincidence measurement can be very close to the quantum Cramér-Rao bound when the phase is between π/4 and π/2. The results show that the use of the photon coincidence measurement scheme can help to achieve ultra-high precision phase measurements in real-world environments, thus offering the possibility of breaking through the traditional scattering noise limit.