Abstract: The explosion welding process of aluminium alloy 6061(thickness of 28 mm) and stainless steel 304L(thickness of 4mm) was investigated. The resutls showed that with stainless steel for base plate, pare aluminium for transition layer and aluminium alloy(thickness of 12 mm and 16 mm) for fly plate, qualified thick aluminium alloy-thin stainless steel clad plate could be obtained after three times of explosion welding.