In-situ　MgB2/Nb/Cu/stainless　steel　multilayer　composite　wire　was　fabricated　by　continuous　tube　forming　and　filling　(CTFF)　processes　using　Mg　and　B　powders　doped　by　SiC.　The　as-obtained　wires　were　sintered　at　various　temperatures　for　different　time　by　a　conventional　vacuum　process.　The　optimized　process　was　found　to　be　830°C　for　15　minutes.　The　MgB2　core　were　investigated　by　the　analysis　of　XRD,　SEM　and　the　magnetic　Jc　measurements.　It　was　shown　that　the　Jc　values　reach　5.87　×　105　A/cm2　(10　K,　0　T)　and　1.06　×　105　A/cm2　(5　K,　3.5　T),　respectively.