  Topological semimetals are a frontier of quantum materials. In multi-band
electronic systems, topological band-crossings can form closed curves, known as
nodal lines. In the presence of spin-orbit coupling and/or symmetry-breaking
operations, topological nodal lines can break into Dirac/Weyl nodes and give
rise to novel transport properties, such as the chiral anomaly and giant
anomalous Hall effect. Recently the time-reversal symmetry-breaking induced
Weyl fermions are observed in a kagome-metal Co3Sn2S2, triggering interests in
nodal-line excitations in multiband kagome systems. Here, using
first-principles calculations and symmetry based indicator theories, we find
six endless nodal lines along the stacking direction of kagome layers and two
nodal rings in the kagome plane in nonmagnetic Ni3 In2 S2 . The linear
dipsersive electronic structure, confirmed by angle-resolved photoemission
spectroscopy, induces large magnetoresistance up to 2000% at 9 T. Our results
establish a diverse topological landscape of multi-band kagome metals.
