The new type of pulse neutron detector consists of two PIN detectors. The respon se for the rays was studied with the pulse gamma sources. The neutron respons e was studied using the DT neutron sources and compared with the scintillator de tector. Results show that the detector is insensitive to gamma radiation, and th e neutron sensitivity was determined by the neutron radiator. It is a new pulse neutron detector in the neutron and gamma mixed radiation fields.