The progress in exploiting new electronic materials and devices has been a major drivingforce in solid-state physics.As a new state of matter,a Weyl semimetal(WSM),particularly atype-Ⅱ WSM,hosts Weyl fermions as emergent quasiparticles and may harbor novel electricaltransport properties because of the exotic Fermi surface.Nevertheless,such a type-Ⅱ WSMmaterial has not been experimentally observed in nature.In this work,by performing systematicmagneto-transport studies on thin films of a predicted material candidate WTe2,we observenotable angle-sensitive(between the electric and magnetic fields)negative longitudinalmagnetoresistance(MR),which can likely be attributed to the chiral anomaly in WSM.Thisphenomenon also exhibits strong planar orientation dependence with the absence of negativelongitudinal MR along the tungsten chains(a axis),which is consistent with the distinctive featureof a type-Ⅱ WSM.By applying a gate voltage,we demonstrate that the Fermi energy can be tunedthrough the Weyl points via the electric field effect; this is the first report of controlling the uniquetransport properties in situ in a WSM system.Our results have important implications forinvestigating simulated quantum field theory in solid-state systems and may open opportunitiesfor implementing new types of electronic applications,such as field-effect “chiral” electronicdevices.