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High sensitivity radio searches of unassociated $\gamma$-ray sources haveproven to be an effective way of finding new pulsars. Using theFive-hundred-meter Aperture Spherical radio Telescope (FAST) during itscommissioning phase, we have carried out a number of targeted deep searches of\textit{Fermi} Large Area Telescope (LAT) $\gamma$-ray sources. On Feb.27$^{th}$, 2018 we discovered an isolated millisecond pulsar (MSP), PSRJ0318+0253, coincident with the unassociated $\gamma$-ray source 3FGLJ0318.1+0252. PSR J0318+0253 has a spin period of $5.19$ milliseconds, adispersion measure (DM) of $26$ pc cm$^{-3}$ corresponding to a DM distance ofabout $1.3$ kpc, and a period-averaged flux density of $\sim$11 $\pm$ 2 $\mu$Jyat L-band (1.05-1.45 GHz). Among all high energy MSPs, PSR J0318+0253 is thefaintest ever detected in radio bands, by a factor of at least $\sim$4 in termsof L-band fluxes. With the aid of the radio ephemeris, an analysis of 9.6 yearsof \textit{Fermi}-LAT data revealed that PSR J0318+0253 also displays strong$\gamma$-ray pulsations. Follow-up observations carried out by both Arecibo andFAST suggest a likely spectral turn-over around 350 MHz. This is the firstresult from the collaboration between FAST and the \textit{Fermi}-LAT teams aswell as the first confirmed new MSP discovery by FAST, raising hopes for thedetection of many more MSPs. Such discoveries will make a significantcontribution to our understanding of the neutron star zoo while potentiallycontributing to the future detection of gravitational waves, via pulsar timingarray (PTA) experiments.

FAST discovery of an extremely radio-faint millisecond pulsar from the Fermi-LAT unassociated source 3FGL J0318.1+0252