Abstarct: Single point incremental forming is a flexible sheet mextal forming technology, which does not require any dedicated die or punch to form a shape. In this method the final shape of the component is obtained by the CNC relative movements of a simple and small punch which deform a clamped blank into the desired shape. These methods are useful for making shapes which are very costly or impossible to produce with other methods and for small quantity production. In this thesis, experimental and numerical study of single point incremental forming process of aluminum alloy aa6061-o were conducted. Two tungsten carbide forming tools of 8 and 12 mm in diameter were used in the experiments. Two types of tool paths were employed. In the first tool path type, the tool moves on a continuous spherical helix path with certain pitch from the largest diameter toward the center in lowermost point, and the contact of tool with workpiece is not interrupted during the forming. In the second one, the path is discontinuous. The tool firstly moves on the axis of the workpiece with a certain normal penetration to the new depth. Thereafter, it moves on a planar helix with a certain radial pitch, from center towards the largest radius in the current depth. Finite element simulations were carried out using Abaqus/explicit software. Considering conditions similar to those in the experiments, effects of major parameters involved in forming such as tool diameter, tool path type and tool normal penetration were studied,. Results of experimental and numerical studies of incremental forming process reveal that strain distribution is considerably improved in second tool path type. The hemispherical punch stretching process was studied experimentally and numerically. The strains obtained in this method were compared with those obtained in the incremental forming process. This comparison showed that very large strains can be achieved in incremental forming without any fracture in sheet, while in the conventional stretching process the sheet fails at significantly smaller strains. Finally, the comparison of the numerical and experimental results revealed a very good agreement between them.