This paper studies two issues critical for China's economy. First, the impact of China's exchange rate policy on exports revenues. We find that a further appreciation of the Yuan would bring a significant decline in China's exports. We therefore recommend a credible, gradual appreciation of the Yuan as far as for future exchange rate policy. Second, we investigate China's portfolio investment in the US. We find that China's investment in has grown significantly. However, China invests only in US government and corporate bonds. The former is understandable because China uses US government bonds to manipulate the value of the Yuan against the US dollar. However, investing only in bonds may not be a good practice. We recommend that China should also invest in US equity to have a more balanced portfolio investment.