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The movement and deposition of the diesel particles have important effect on the particle sampling measurement, the operation of the exhaust gas recirculation system and the trapping of the particles. The forces imposed on the emission particles of diesel engine and the deposition characteristics of the emission particles of diesel engine in the turbulent flow channel were investigated under different conditions by using the force modes and the particle random trajectory mode established. The results showed that the Stokes drag force, Brownian force, Saffman lift force, thermophoresis force, gravitation force, and buoyancy force imposed on the emission particles had strong relations with the dimension of the particles and the distance of the particles far from the wall. The main driving forces for the depositing of the emission particles were different under different conditions. The forces, the flow inlet velocity and temperature and the channel dimensions affected the deposition of the emission particles in the turbulent flow channel.