In order to choose a proper ionic liquid solution system to electrodeposit Ir layer and provide theoretical bases for electrodepositing Ir layer in ionic liquid,it is necessary to study the electrochemical properties and solubility of IrCl3 in ionic liquid. Electric conductivity of four different ionic liquids was studied using conductivity meter and electrochemical window,which was measured by cyclic voltammetry( CV) method. The IrCl3 solubility in ionic liquids was studied using ultraviolet-visible( UV-Vi...