This study aims to investigate the property of engine performance and the material property of exhaust gas by application of the intake swirler The fuel of BDF 20 was made by mixing 80% of diesel fuel and 20% of biodiesel fuel. These fuels were used and tested in the diesel engine of CRDI type used currently. The swirler was made by streamlined shape to lessen the intake resistance, The three types of its wing angle are $20^{circ}$, $40^{circ}$ and $60^{circ}$. From experimental results, we found that the characteristics of engine performance, soot was effective in wing angle of $20^{circ}$ and NOx was effective in $60^{circ}$.