Abstract: Facing severe resource disadvantage, it is difficult for new firms to survive in the emerging industry. Previous studies on how enterprises can break through the resource constraints, develop the opportunity successfully and construct the competitive advantage are lack of depth inspection. Based on this, the research conducts a multi-case study with three state-owned new energy automobile firms to reveal the inner mechanism of competitive advantage construction and propose the theoretical model of entrepreneurial opportunity-resource development behavior. The results are that owing to the state-owned parent company, initial resource drives the effectuation bricolage with the resource at hand and network bricolage. In addition, effectuation bricolage promotes the opportunity identification, network bricolage advances the opportunity exploitation and then constructs the start-up competitive advantage.