Qianghuo, as a medicinal plant , has been demonstrated useful for the treatment of ache diseases in China. The physicochemical characterization of Qianghuo particles was greatly influenced by ultrafine pulverization. To study the physicochemical characterization of Qianghuo, the raw plant material of Qianghuo was ground to 5 μm particles by HSCS (High Speed Centrifugal Sheering) pulverizer. The micron particles were characterized by optical microscope and SEM. Ferulic acid is special chemical component of Qianghuo, and its extraction yield was determined to evaluate the chemical characterization of Qianghuo powder. Ferulic acid was analyzed by HPLC (High Performance Liquid Chromatography). The results showed that after ultrafine pulverization ,the plant cell walls were broken into pieces and the extraction yield of ferulic acid was increased by 30.24% compared with the original particles.