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We present the discovery of three pulsars in Globular Cluster M15 (NGC 7078)by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). In thethree pulsars, PSR~J2129+1210J (M15J) is a millisecond pulsar with a spinningperiod of 11.84 ms and a dispersion measure of 66.68 pc cm$^{-3}$. BothPSR~J2129+1210K and L (M15K and L) are long period pulsars with spinningperiods of 1928 ms and 3961 ms , respectively, while M15L is the GC pulsar withthe longest spinning period till now. The discoveries of M15K and L support thetheory that core-collapsed Globular Clusters may contain partially recycledlong period pulsars. With the same dataset, the timing solutions of M15A to Hwere updated, and the timing parameter P1 of M15F is different from theprevious results, which is approximately 0.027$\times 10^{-18} ss^{-1}$ fromour work and $0.032 \times 10^{-18} ss^{-1}$ fromAnderson's\citep{anderson-1993}. As predicted by Rodolfi et al. , theluminosity of M15C kept decreasing and the latest detection in our dataset ison December 20$^{\rm th}$, 2022. We also detected M15I for one more time. Thedifferent barycentric spin periods indicate that this pulsar should locate in abinary system, manifesting itself as the exceptional one in such acore-collapsing GC.

Three Pulsars Discovered in Globular Cluster M15 (NGC 7078) with FAST