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In our work, we analyse $5\times10^{4}$ single pulses from the recycledpulsar PSR J2222$-$0137 in one of its scintillation maxima observed by theFive-hundred-meter Aperture Spherical radio Telescope (FAST). PSR J2222$-$0137is one of the nearest and best studies of binary pulsars and a uniquelaboratory for testing gravitational theories. We report single pulses' energydistribution and polarization from the pulsar's main-pulse region. The singlepulse energy follows the log-normal distribution. We resolve a steeppolarization swing, but at the current time resolution ($64\,\mu{\rm s}$), wefind no evidence for the orthogonal jump in the main-pulse region, as has beensuspected. We find a potential sub-pulse drifting period of $P_{3} \sim3.5\,P$. We analyse the jitter noise from different integrated numbers ofpulses and find that its $\sigma_{j}$ is $270\pm{9}\,{\rm ns}$ for 1-hrintegration at 1.25 GHz. This result is useful for optimizing future timingcampaigns with FAST or other radio telescopes.

Variability, polarimetry, and timing properties of single pulses from PSR J2222-0137 using FAST