In response to the new definition of "Candela", the research on measurement of photodetector quantum efficiency (QE) with entangled photon method is carried out, and a complete QE measurement setup is established. From a Type-I phase match BBO crystal pumped by a 351.1 nm CW laser, the correlated photons are generated, potomultiplier tube (PMT) QE is calibrated at 702.2 nm and 788.7 nm based on the coincidence count system which is realized with a dual-channel gated photon counter. At the same time, the key factors which influence the QE measurement are analyzed, including single-photon pulse acquisition, noise suppression and extraction, time related character about coincidence, accidental coincidence counts, dark counts, transmittance of optics. In the end, the measurement uncertainty of QE at the two wavelengths is less than 0.7%.