In this paper, a phenomenological simulation model has been developed to predict performance, thermal efficiency, pollutant emissions, and evaporating diesel spray distribution in the combustion chamber of a direct injection diesel engine. The model consists of two major parts, that is, the spray combustion model and the spray_distribution model. In the models, injected fuel spray is divided into many packages. Each package goes through such processes as fuel spray broken, droplet evaporation, air entrainment, flammable limit of mixture, and mixed air-fuel combustion, etc. The spray_combustion model also enabled to calculate subsequent spatial and temporal history of burning rate, local temperature, NO emission and soot. According to this information, distribution of temperature and mass of liquid and vapor fuels, and the wall impinging spray pattern in the combustion chamber were described three dimensionally using a 3-D volume rendering application by the spray distribution model. In the spray distribution model, it is thought that distributions of wall impinging sprays have significant effects on the air entrainment, mixture formation and combustion processes in direct injection diesel engines. It is validity to use this phenomenological simulation model as a practical computational tool for estimating diesel spray behavior.