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A rapid, phenomenological model that predicts particulate matter (PM) emission of diesel engines is developed and formulated. The model is a chemical equilibrium composition model, and is based on the formation mechanisms of PM and unbed hydrocarbon (HC) emissions of diesel engines. It can evaluate the emission concentration of PM via the emission concentration of HC. To validate the model, experiments are carried out in two research diesel engines. Comparisons of the model results with the experimental data show good agreement. The model can be used to evaluate the concentration of PM emission of diesel engines under lack of PM measuring instruments. In addition, the model is useful for computer simulations of diesel engines, as well as electronic control unit (ECU) designs for electronically controlled diesel engines.