By taking over Cypress Semiconductor, Infineon completed a stage of its development strategy. This study takes the case of Infineon take over Cypress Semiconductor as an example to analyse the advantages and risks of M&A across country for acquirer. In the great backdrop of semiconductor industry’s fast development, this measure completes the short come and expand the products’ scope of Infineon’s business, making automobile electronics the pillar part of its revenue. The strengthen of business in China also helps to improve the firm’s revenue. It is obvious that M&A across country brings the acquirer new market and new guests in other region outside its own country, and improves one’s industrial technology. Besides advantages, M&A across country brings risks on different aspects. In financial aspect, it may lay capital burden on the firm, causing difficulty in turnover. Besides, politics of the two firms’ country and laws are possible to be sensitive. Companies need to be careful not to violate them. For the corporations who want to complete a successful M&A, they should better look into the detailed information of both themselves and the target firm, including their needs and anti-risk ability. Carefully assessments toward the risks and benefits are import before making the final decision. These results shed light on guiding further exploration of M&A with multi-nations.