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HD49798 is a hydrogen depleted subdwarf 06 star and has an X-ray pulsating companion(RX J0648.0-4418).The X-ray pulsating companion is a massive white dwarf.Employing Eggleton's stellar evolution code with the optically thick wind assumption,we find that the hot subdwarf HD 49798 and its X-ray pulsating companion could produce a type Ia supernova(SN Ia)in future evolution.This implies that the binary system is a likely candidate of an SN Ia progenitor.We also discuss the possibilities of some other WD+He star systems(e.g.V445 Pup and KPD1930+2752)for producing SNe Ia.