The structure of fluid Hg along the liquid-vapour coexistence curve hasbeen modelled by applying the reverse Monte Carlo method to thestructural factors recently obtained by x-ray diffraction usingsynchrotron radiation at SPring-8 [J. Non-Cryst. Solids 312-4 (2002)284]. The modelling reveals that the distribution of coordinationnumbers of the first-neighbour shell, P(N), broadens andshifts to lower values at high temperature and high pressure. The mainpeak of bond angle distributions function P(cos ), located at60°, is rather sharp at room temperature, but it damps andbroadens seriously as temperature increases. When approaching themetal-non-metal transition, P(N) of the atoms with shorter bonds broadensand shifts toward lower values noticeably, but little change occurs forthat of longer bonds. The changes of the coordination number and thedistribution of the atoms with the shorter bond are closely related tothe metal-non-metal transition of fluid Hg.