Many great efforts have been made to investigate the Chiral Magnetic Effect (CME), which replies on the existence of extremely large electromagnetic fields in relativistic heavy-ion collisions. However, the recent CMS measurements in small systems challenge the traditional CME interpretation, indicating that the dominant contribution to the CME observable of charge azimuthal correlation ($\gamma=
In this work, we investigate the properties of the electromagnetic fields in small systems by using a multiphase transport (AMPT) model . We find that compared to A+A collisions, the magnitudes of absolute electric and magnetic fields in small systems are comparable. We show that the correlation of $
 X. L. Zhao, Y. G. Ma and G. L. Ma, [arXiv:1709.05962 [hep-ph]].
 A. M. Sirunyan et al. [CMS Collaboration], [arXiv:1708.01602 [nucl-ex]].
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