;According to the market driven and globalization, mergers and acquisitions of enterprises are a natural and inevitable trend. Mergers and acquisitions are undoubtedly focused by global technology industry and investors especially in the field of large scale of IC semiconductor recent years. Whether the success of the merge, the result of expected synergy or the beginning of recession, the process of negotiation and the direction of decision making are relied on chief management’s wisdom and their strategy. The ultimate success factor of the enterprise merger and acquisition includes the market analysis before merging and system integration of two companies after merging, so the new appearance comes out. The study takes parallel merge case by Intel, the leading CPU Company and Altera, the strong FPGA Company as an example, to investigate how these two companies succeeded in reaching an agreement to complete the merger and acquisition. By considering four critical structures through the merger and acquisition – environmental, market, organizational and financial structure as research criteria; the methodology was completed by an expert-level questionnaire, which included four major facets and a second level of multiple criteria. Targeting was total of 10 high level management and heads of department in various fields. This study uses Decision Making Trial and Evaluation Laboratory analysis to find out the relevance of each factor′s facet, screening out the key success factors that affect corporate mergers and acquisitions. The result of study shows that the wiliness between two companies is the most basic factor. Through the interaction of other facet criteria, we can conclude that the right direction and criteria must be followed. With the guidelines, hope that the result of the research will enable chief officer for future corporate mergers and acquisitions no matter experienced or inexperienced.