Foreign language anxiety in English learning has always been a major focus of English teaching research. How to relieve English majors' foreign language anxiety and improve their classroom participation becomes an imperative issue for English teachers. Based on the American teaching model of Sheltered Teaching and Observation Protocol (SIOP), this study explores whether the SIOP teaching model can help relieve English learning anxiety. The experiment on 60 freshmen majoring in business English shows that the SIOP model can relieve students' foreign language learning anxiety and improve their classroom participation. The SIOP teaching model is worth popularizing in business English teaching.