The fabrication process of the honeycomb filter was investigated using synthesized cordierite with the addition of pore former and extrusion additives (either organic matter or graphite). Also, the effect of additives on the resultant properties of honeycomb filter such as porosity, thermal expansion coefficient and mechanical strength were investigated. With increasing the organic matter up to 10 wt%, porosity was increased but compressive strength was decreased. With increasing the graphite content, however, both porosity and compressive strength were increased. The specimen with an optimum processing condition (C-17A30G, sintering at $1150^{circ}C$) was demonstrated 59% in porosity, 69 MPa in compressive strength, and $2.4{ imes}10^{-6}/^{circ}C;(25{sim}1000^{circ}C$) in thermal expansion coefficient, which physical properties are appropriate for the honeycomb filter applications.