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According to the monitoring of the industrial damage early warning system of the Ministry of Commerce, in April 2012, of the 405 kinds of mechanical products monitored by the Industrial Security Database, the ex-factory prices of some products fluctuated significantly. Among them, the welding wire machine ex-factory price chain rose the first place, 41.50%, the ex-factory price of diesel locomotives ex-factory increase year-on-year, was 44.10%; temperature sensor home ex-factory price fell first in the chain, was -44.88%, the power transformer factory ex-factory prices fell year-on-year The first place is -41.50%.