This study investigated the elementary school teachers¡¦instructional efficacy in Taiwan. Research variable consist of teachers¡¦background variable such as gender ,marriage status ,educational background,years of teaching ,and administratived duty and school environment variables such as school size and school location. A questionnaire was constructed to collect the information concerning the language teachers¡¦instructional efficacy. A total of 350 elementary school language teachers in Pin-Tung County,Taiwan were selected as subjects by means of a stratified random sampling approach. Survey data were statisfically analyzed,and the research hypotheses were tested.The results indicate that the level of overall instructional efficacy of elementary school language teachers was above average and that some domain¡¦s of teachers¡¦instructional efficacy were affected by the factors of teachers¡¦gender and schools¡¦locales.