The optical characteristic of littoral aerosol influenced by typhoon is analyzed, through measuring aerosol optical thickness with sunphotometer CE317 in a Langley method in the 19th typhoon period in 2005. Aerosol is changed obviously after typhoon, the thin particle amount decreases and thick particle amount increases. Aerosol optical thickness, ngstrm parameter α and atmosphere turbidity parameter β reach to the lowest ralue of 0.132(550 nm),0.861 and 0.079 respectively. The percentage of thin particle and thick particle in a unit volume amount, the size distribution of aerosol and amount concentration of aerosol particle are measured by aerodynamic particle sizer spectrometer, which agree well with the above α,β value.