Abstract: According to the real conditions of vertical dead Ioads borne by a basket-like truss arch, the internal forces in the basket-like truss arch affected by elastic compression of arch axis are discussed, and some formulas for calculating additional forces caused by that at the elastic center are derived. It is shown from a numerical example, that the elastic compression of arch axis after loaded will change the distributing regular of internal farces slang arch axis to a considerable degree. At this, it should be considered by person who will design this structure. A. data table related to some formulas is also given for facilitate applicatian.