May 4, the domestic commodity market to reproduce a large area limit, black plate across the board defeat. At the close, the main contract for the four main commodities of the iron ore, hot rolled, rubber and Zheng alcohol was closed at the limit, and the main contract losses of thread, coke and coking coal were 6.15%, 6.01% and 5.75% respectively. Other plates, PVC fell 4.02%, asphalt, copper, glass and other commodities fell more than 3%. In the commodity researchers view, the current commodity market fundamentals can be, low tide may lead to an important reason for the crash.