Situational awareness and mashups are two key factors influencing the success of situational language teaching. However, traditional situational language teaching cannot smoothly conduct relevant learning activities in changing learning context. This study developed a situational mashups system for detecting users' context and proposed a research model for evaluating users' acceptance on the situational mashups in situational language teaching. The proposed model consisted of users' individual experiences, situational learning theory and technology acceptance theory. The experimental results showed that users' experiences of using computer, Internet, mashups system and mashups-based learning, as well as users' perceived enjoyment, perceived usefulness and perceived ease of use of situational mashups are all key factors affecting users' acceptance of situational mashups in situational language teaching.