As the precursor of precipitates, carbide clusters, generally formed at the initial annealing stage,govern the precipitate formation and determine the microstructure.The formation and evolution of titanium carbide clusters in ferrite during the early isothermal annealing process were investigated via molecular dynamics (MD) simulation, aiming to understanding the properties of clusters and the driving force for precipitation.The formation mechanism of titanium carbide clusters in ferrite was disclosed based on a dislocation-motivated formation model.