Abstract: A multi-detector fast neutron time of flight spectrometer is built at HI-13 tandem accelerator and compared with existing ones. The spectrometer will be used for measurements of fast neutron scattering angular distributions and double differential cross sections of secondary neutrons as well as charged particle induced neutron emission spectrum study. Main parts of the spectrometer (including beam pick-off system, deuterium gas target, neutron detector and electronics) are described briefly. The performance of the spectrometer and some applications in fast neutron experiment are also depicted.