Abstract: ²⁵²Cf neutron source with the neutron multiplicity distribution is the preferred neutron source for the neutron coincidence counting measurement and calibration. In this paper, the influence of ²⁵²Cf source intensity on neutron coincidence counting is studied by numerical simulation. According to the data processing method of neutron coincidence counting experiment, the neutron pulse sequence with the tag of spontaneous fission eventsisgenerated, and processed according to the shift register logic to give the resultof neutron coincidence measurement. Based on the simulation results of the neutron multiplicity distribution of foreground（R+A） and background（A） under different source intensities, the influence of source intensities on the proportion of real coincidence in the foreground measurements is analyzed quantitatively. The results show that when the ²⁵²Cf emits several hundreds or thousands neutrons per second, the real coincidence counting take a dominant position or above 50% in the coincidence counting of foreground R+A which includes the real coincidence and the accidental coincidence, and the ²⁵²Cf with such strength is suitable for the measurement. When the ²⁵²Cf emits tens of thousands neutrons per second, the ratio becomes about 10%, and when the ²⁵²Cf emits hundreds of thousands neutrons per second, the real coincidence is about only 1% and flooded by the accidental coincidence, and the ²⁵²Cf with such strength is not suitable for the measurement. The results can benefit the choice of ²⁵²Cf for the measurement, as well as the validation check of the measurement data.