In this study the diesel vehicle engine exhausts emissions, particularly Diesel Particulate Matterrnand its impact on health and environment is discussed briefly. The filtration method used tornremoves this particulate matter from diesel exhaust gases is using wall flow diesel particulaternfilter through physical filtration. The filter designed for this application has a honeycombrnstructure with long parallel flow channels and the opposite ends of adjacent channels arernalternatively capped, forcing gas to flow through porous side walls leaving soot behind on thernsurface of the walls that would result in an adverse impact on engine performance.rnTherefore the Diesel particulate filter regeneration system strategy (passive type), whichrnpromotes the oxidation of carbon soot trapped in diesel particulate filter under normal enginernoperation condition is applied in this study. This is achieved by catalyst coating on the filter cellrnmembrane to facilitate the soot trap combustion. in addition, Filter design parameters like filterrnsize and filter cell configuration which is responsible for the save regeneration are identified.rnThe mass flow rate of Diesel Particulate Matter Emission from diesel vehicle engine underrndifferent operation condition (speed and loading) is considered by using weighting factor forrneach operation point. Mass based particulate matter emission from diesel engine obtained in thisrnstudy is 36.01 (g/hr). for filter with 80% ,85% ,90% filtration efficiency of DPF: the Mass ofrnPM released to atmosphere in (g/bkw.hr) are 0.082, 0.062, 0.041 respectively, where the EuropernPM emission limit standards is achieved above 85% of filtration efficiency . The pressure droprnacross Diesel Particulate Filter is predicted (2.81kpa) using soot layer thickness model.rnFinally, regeneration behavior of diesel particulate filter using comsol multi physics by couplingrnthe exhaust gas flow(maximum flow velocity 4.2m/s),Particulate matter concentrationrndistribution in DPF model [maximum 12.5 mil (mol/m3) and 5mil(mol/m3) ]and the filter wallrntemperature distribution(500 and 705 in K) due to soot trap oxidation reaction in DPF. Fromrnthe passive regeneration system applied the catalyst coated on the filter porous membranerninitiates the burning-off particulate matter in filter channel , reduces the oxidation temperature ofrnsoot trap and keeps clean the diesel particulate filters under normal engine operation condition.