The semi-detached eclipsing binary system BP Muscae has been analysed using the Wilson-Devinney program. The physical and orbital parameters have been determined through a self-consistent simultaneous solution of light curves in seven colours and of the radial velocity curves of both components. The 373 photometric measurements of BP Mus in the 7-colour GENEVA system are listed in the table. P and Q are the weights in colours and V magnitude (see Rufener, 1988, Cat. <II/169>).