Stellar nucleosynthesis beyond iron-group nuclei provides additional problems that we do not encounter when studying nucleosynthesis processes for light nuclei. Besides ambiguity in the determination of astrophysical sites/conditions, uncertainties in nuclear physics inputs have signifiant impacts on the theoretical nucleosynthesis predictions. In this talk, I present recent results of comprehensive nucleosynthesis studies, focusing on the uncertainties of relevant nuclear reactions and decays. The evaluated uncertainty range for the several nucleosynthesis processes, e.g., s- and r-processes, gamma-process and nup-process, are discussed. I also show the lists of “key reactions”, which have strong impacts on the nucleosynthesis yields, based on our Monte-Carlo based analysis.