Short-term copper market is facing more risk factors, the dollar strengthened sharply and China's economic performance continues to pressure the weak copper prices, ample supply also suppress the market price of copper down. Copper prices are expected to remain weak market outlook, short-term rebound in space is limited, the market outlook there will be a large downside. Low trend operation strategy: cu1411, empty single participation, target 47500; below 48500 appropriate jiacang empty one.