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New CCD photometric observations and their investigation of the W UMa-typebinary, V870 Ara, are presented. Light curves of the system were taken throughBVI filters from the Congarinni Observatory in Australia. The new ephemeris iscalculated based on seven new determined minimum times, together with the TESSdata and others compiled from the literature. Photometric solutions determinedby the Wilson-Devinney (W-D) code are combined with the Monte Carlo simulationto determine the adjustable parameters' uncertainties. These solutions suggestthat V870 Ara is a contact binary system with a mass ratio of 0.082, a filloutfactor of 96+-4 percent, and an inclination of 73.60+-0.64 degrees. Theabsolute parameters of V870 Ara were determined by combining the Gaia EDR3parallax and photometric elements.

The New Ephemeris and Light Curve Analysis of V870 Ara by the Ground-Based and TESS Data