We define Riemann – Banach space and the space conformal to the Euclidean planer space, then we create The necessary and sufficient conditions in order to be Riemann – Banach space conformal to the Euclidean space, then we prove that constant- curvature Riemann – Banach spaces which have are conformal to the Euclidean space. Finally, we create locally, the measurement in constant curvature Riemann –Banach spaces.