  We report timing and spectral studies of the high mass X-ray binary 4U
1700-37 using Insight-HXMT observations carried out in 2020 during its
out-of-eclipse state. We found significant variations in flux on a time-scale
of kilo-seconds, while the hardness (count rate ratio between 10-30 keV and
2-10 keV) remains relatively stable. No evident pulsations were found over a
frequency range of $10^{-3}$-2000 Hz. During the spectral analysis, for the
first time we took the configuration of different Insight-HXMT detectors'
orientations into account, which allows us obtaining reliable results even if a
stable contamination exists in the field-of-view. We found that the spectrum
could be well described by some phenomenological models that commonly used in
accreting pulsars (e.g., a power law with a high energy cutoff) in the energy
range of 2-100 keV. We found hints of cyclotron absorption features around ~ 16
keV or/and ~ 50 keV.
