In recent years, high concentration of insoluble iron sulfides, including FeS₂ and FeS, have been found in the marine wooden shipwrecks. These iron sulfides can be oxidized to form sulfuric acid, which rapidly damages the wood cellulose when the wooden shipwrecks are exposed to conditions of high humidity and oxygen. Removal of those pyrite compounds is currently a problem worldwide. This paper summarizes some preliminary research to remove iron sulfides in the wrecks of wooden Qing Dynasty ships in Ningbo, Zhejiang Province, China. In addition, a new reagent named EDTAHO that uses a combination of a metal complex and an oxidant has been developed to remove the iron sulfides. The test results are satisfactory and should prove useful for future conservation work involving dehydration and reinforcement of wooden marine shipwreck relics.