In order to study the differences between the abilities of dissolution to feldspar of organic acids and inorganic acids and the differences between the abilities of dissolution to feldspar of different organic acids. Under conditions in the 80 ℃, Dissolution simulation study About alkali feldspar and plagioclase has been done in solution with different pH value (4，6 and 8), respectively, containing hydrochloric acid, acetic acid and oxalic acid. The experimental results show that: under the conditions of acid (pH = 4) and weak acid (pH = 6), the dissolution ability of acetic acid to two kinds of feldspar is greater than oxalic acid. Under Alkaline conditions (pH = 8), oxalic acid has the largest dissolution ability. Under either acid or alkaline conditions, the dissolution ability of organic acids to feldspar is greater than inorganic acid. Under acidic (pH = 4) conditions, dissolutions of plagioclase and alkaline plagioclase have little difference. Under the weak acid (pH = 6), and alkaline (pH = 8) conditions, dissolution of plagioclase is higher than alkaline plagioclase.