Our aim is to investigate the detail crystal and magnetic structure of single crystal Ni2MnGa. The measurements will be done using neutron diffraction technique. These measurements will resolve the disagreement in literature and provide valuable new input to the understanding of the origin of modulation in Ni2MnGa. As the modulation introduces atomic displacements, which must be correlated with the magnetic properties. Therefore complete structural study of Ni2MnGa FSMA with taking into account the complex interplay between incommensurate nuclear and magnetic structure will be done.