1) The size controlled polymer polyvinylpyrrolidone stabilized ruthenium nanoclusters were prepared from low boiling point monohydric alcohols such as n-butanol; (2) special morphology ruthenium nanoclusters were synthesized in n-propanol and characterized in detail; (3) the factors influencing the particle size and morphology of the generated ruthenium nanoclusters were explored. In this paper, the characteristics of nano metal clusters, the preparation and characterization of nano metal clusters, and the morphology of nano metal clusters are systematically reviewed. Nanomaterials refer to the materials whose geometric dimensions reach nanometer scale and have special properties. The special structure of nano materials (such as large specific surface, small size effect, interface effect, quantum effect and quantum tunneling effect) determines that nano materials exhibit many unique properties different from traditional materials, and further optimizes the electrical, thermal, optical and catalytic properties of materials. As a catalyst, transition metal nanoclusters are heterogeneous catalysts and bridges between homogeneous and heterogeneous catalysts. Therefore, nanoscale metal clusters, especially platinum group metal particles, have attracted extensive interest of researchers. This paper analyzes the defects in the preparation methods of soluble ruthenium nanoparticles reported in the literature, and aims to explore a more optimized synthesis process. In this study, a series of ruthenium nanoparticles with different sizes of polyvinylpyrrolidone were prepared by heating or refluxing RuCl 3 · NH 2O low boiling point monohydric solution. By changing the type of alcohol solvent, the temperature of reduction reaction, the amount of polymer protectant and the concentration of precursor salt, etc