Gold is a pure FCC metal which is a good conductor of electricity but lacks mechanical strength. There are ways to strengthen the materials like refining grain size, solid solution alloying etc., but these methods lead to loss of electrical properties due to more scattering of electrons and also reduce ductility. Hence, we need to find a way to strengthen the material without sacrificing other properties. It has been observed that materials with nanotwins containing coherent and incoherent twin boundaries, improve the strength of the material by impeding the motion of dislocations and also maintained ductility [1] with electrical properties similar to the coarse grain counterpart [2]. We wish to see these results in gold as it has properties like corrosion resistance and it is chemically inert, which makes it a good choice for many applications. In this context, we performed atomic scale simulations of a single crystalline gold thin film containing one finite nanotwin formed from coherent and incoherent twin boundaries, using two interatomic potentials. The structure is constructed according to the initial structure of experimental samples in which tensile tests are performed and growth of twin is observed in some loading directions. We choose the potentials with respect to the correspondence of their gamma curves with the ones obtained from ab initio calculations. The aim is to better understand the deformation mechanism in the nanotwinned gold thin film. We perform the deformation of the sample in the direction which is similar to the experiment. The preliminary results of the thin film deformation under tension show the glide of partial dislocations along the coherent twin boundary and the detachment of partial or extended dislocations from the junction between the coherent and incoherent twin boundaries.