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In 2015 October, the Be/X-ray binary 4U 0115+63 underwent a type II outburst,reaching an X-ray luminosity of $\sim$ {\DP{38}\es}. During the outburst,Nuclear Spectroscopic Telescope Array ({\it NuSTAR}) performed two Target ofOpportunity observations. Using the broad-band spectra from {\it NuSTAR}(3$-$79 keV), we have detected multiple cyclotron lines of the source, i.e.,$\sim$ 12, 16, 22 and 33/35 keV. Obviously, the 16 keV line is not a harmoniccomponent of the 12 keV line. As described by the phase-dependent equivalentwidths of these cyclotron lines, the 16 keV and 12 keV lines are two differentfundamental lines. In our work, we apply the two-poles cyclotron line model tothe observation, i.e., the two line sets are formed at the same altitude($\sim$ 0.2 km over the NS surface) of different magnetic poles, with $\sim${1.1\TDP{12}} and {1.4\TDP{12}} G in two poles, respectively.

A peculiar cyclotron line near 16 keV detected in the 2015 outburst of 4U 0115+63?