Exchange bias (EB) effect, characterized by a shift of the hysteresis loop along the magnetic field axis, has attracted considerable attention because of its significance in fundamental research and practical applications such as spin valve devices. This effect usually occurs in bilayers or multilayers constituted of ferromagnetic and antiferromagnetic layers. Antiperovskite compounds with formula Mn3AN (A=Zn, Co, Ni etc.) crystallize into Pm-3m space group, with the magnetic Mn atoms located on the face centered positions. We have considered antiperovskite Mn3ZnN as a candidate material with strong EB effect since our previous work on Mn3ZnN has shown a rich magnetic phases. To uncover the origin of EB effect in antiperovskite compound, it is essential to work out the related magnetic structure by means of neutron powder diffraction.