The layered half-metal Co3Sn2S2 with a Kagomé lattice in the a-b plane has been recently discovered as a magnetic Weyl semimetal, whose Weyl nodes are only 60 meV above the charge neutrality point. It is a quasi-2D ferromagnet with TC= 177 K and a magnetic moment at Co sites along c-axis.By doping Ni into Co3Sn2S2 compound, the ferromagnetism is systematically suppressed, and a nearly linear dependence of the resistivity shows in the normal state, suggesting a possible ferromagnetic quantum critical point. We propose to carry out zero-field (ZF) and longitudinal field (LF) µSR measurements on Co3-xNixSn2S2 polycrystalline samples down to 50 mK, to confirm the existence of the ferromagnetic QCP in Co3-xNixSn2S2 system and determine its location of Ni doping level. We request in total 7 days of beam time on the MUSR spectrometer or 9 days on EMU (two days for two times dilution cooling).