The organic acids in ambient were sampled by high efficiency diffusion scrubber (HEDS) and analyzed by IC. Most of organic acids showed high linearity (r²＞0.999) of the calibration curve and good repeatability (RSD＜10%). The detection limit of organic acids was about 7 pptv. The concentration of acetic acid was ranged from 0.43~1.74 ppbv, formic acid was ranged from 0.28~1.85 ppbv. Since the organic acids are one of odor compound species with instant production characteristics and affected easily by weather, continuous analysis method is better than intermittent method to determine these compounds. The sampling and analysis process can be automated and performed in real-time by continuous sampling of HEDS and IC.