Abstract: A field survey including physics and chemistry of precipitation at Houkeng Village in Xiamen City was carried out from March 25 to April 8, 1993, pH value and ions chemical composition of rain samples were measured. The results show that the precipitation in spring at this village was a type of sulphuric acid and was caused by air pollution resulted from coal combustion, and its weighted average pH value was 4.22; the distribution type of rain droplets in precipitation was different following rain strength variation, i.e. the distribution was a type of monotone decrease while the rain strength was small, and the distribution appeared peak while the rain strength was getting bigger.