With the development of formation element logging

it is one of the key points for technicians to improve the resolution of detectors in the probe. In recent years

the LaBr

3

:Ce scintillation detector has been gradually implemented in the field of neutron logging with excellent response performance. Based on the Monte Carlo method

the sedimentary energy spectra of LaBr

3

:Ce and NaI detectors are compared and analyzed. The formation logging model is established. The energy spectra of hydrogen H and Fe are observed by D-T pulse neutron source and two kinds of detectors. The simulation results show that the LaBr

3

:Ce detector has higher calculation accuracy than the NaI detector when the interference of various formation elements is overlapped when measuring common formation elements. The LaBr

3

:Ce high resolution crystal is in the complex formation. The detection efficiency in elemental logging is higher.