  We study the possibility to apply phenomenological approach to the
description of magnetic transitions in UGe2 with the help of Landau free energy
expanded to 8-th order in magnetisation. The analysis shows that for certain
values of parameters in front of M^4, and M^6 terms in the free energy there id
possibility for the appearance of two successive phase transitions between the
low-magnetisation and high-magnetisation phase with the same structure. We
establish the relation of the parameters in Landau energy, for which the phase
transition from the disordered to low-magnetisation phase is of second order as
the experimental data shows. Within our approximation the transition between
two magnetically ordered phases is of first order
