Abstract: The critical load of acid deposition in Minnan area was studied from 1993 to 1994. Due to the consideration of the two kinds of acid deposition, i.e. dry and humid, a new method was tried out for calculating critical load. The critical load of dry acid deposition was represented by the SO₂ capacity of trees and crops, and the critical load of humid acid deposition was determined by the acid buffering capacity of soil. It is shown that the critical loads of dry and humid acid deposition are much higher the real loads at present in Minnan area.