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LWD neutron porosity measurement can be measured porosity rock, which is an important means for exploration of oil and gas.It Can be directly used for oil (water) gas reservoir, inference. It can also help determine the other such as lithology, clay content, water saturation and formation parameters.And it can be combined with other logging parameters, accurate evaluation of formation lithology geological parameters, can play an important role in the exploration and development of oil.This paper introduces the principle of neutron porosity logging, designed a set of drilling with the structure of neutron porosity logging device, the key circuit design and production of neutron porosity logging device is required, and the device was well test.