Although the discovery/creation of entrepreneurial opportunities are extremely important, the process of analysis, evaluation and screening of the ideas cannot be ignored. This study selects two companies from China as case to explore the mechanism between the evolution of cognitive logics and entrepreneurial opportunities. We find that the entrepreneur/entrepreneurial team will pay attention to the innovation, consensus and practicality of ideas, and the cognitive logics using different knowledge structures in the evaluation of ideas include three types of, i.e., single, parallel and natural, logics. Finally, this explores the deeper reasons for the mutual transformation between discovery opportunities and creation opportunities.