The Chinese currency, or the yuan, on Tuesday weakened 7 basis points to 6.5625 per US dollar from Monday.
Hong Kong stocks fell 90.48 points, or 0.39 percent, to close at 23,068.19 Monday.
The ChiNext Index, launched by the Shenzhen Stock Exchange (SSE) on June 1, 2010, fell 20.23 points, or 1.89percent, to 1,052.11 Monday.
China's stock index futures closed lower Monday with the contract for April, the most actively traded, down 0.25percent from the previous trading day to 3,296.6.
Chinese shares closed mixed Monday with the benchmark Shanghai Composite Index up 6.19 points, or 0.21 percent, to 2,984.01.
China's central bank said Friday the US dollar is expected to weaken with the slow recovery of the US economy, and global commodity prices will increase due to greater demand.
The ChiNext Index, launched by the Shenzhen Stock Exchange (SSE) on June 1, 2010, fell 5.65 points, or 0.52 percent, to 1,072.34 Friday.
China's stock index futures closed higher Friday with the contract for April, the most actively traded, up 0.91percent from the previous trading day to 3,298.4.
Chinese shares closed higher Friday with the benchmark Shanghai Composite Index up 31.11 points, or 1.06 percent, to 2,977.81.
China's lead futures gained 3.19 percent on debut in Shanghai on strong interest from local companies to hedge risks.
The Chinese currency, or the yuan, on Friday strengthened 45 basis points to 6.5580 per US dollar from Thursday.
Stocks on the Chinese mainland fell for the first time in five days on concerns that a surge in commodity prices will spur inflation and curb earnings growth.