Synthesis of Boehmite particles were performed through the precipitation of aluminium nitrate (Al3(NO3)3 9H2O) with ammonia water (NH4OH) by changing solution pH, mixing procedure, temperature, and feeding flux. The influence of the synthesis condition, which affected on the pH range of the Boehmite formation, particle morphology and pore property, was investigated. The Boehmite particles were formed in the reaction solution of pH 7.5 9. The particles prepared by P2jet type which maintained the pH uniformly during the precipitation resulted in homogeneous particles and pores because of the constant concentration of the reacted ion in the solution. It was resulted in the improvement of the specific surface area and pore volume of the particle at the same time. With the increasing of temperature and the decreasing of the feeding flux, it was occurred the large specific surface area and pore volume. Also it was presented the fibrillar shaped particles upper 60℃ of the reaction temperature. In this study, the optimal condition of the porous Boehmite was in P2jet type with 90℃ of reaction temperature and 2.5 mL/min of the feeding flux. At this time, the specific surface area, pore volume, and average pore size was 385.46 m2/g, 1.0252 mL/g, 10 nm, respectively.