The present research aimed at investigating the effectiveness of enhancing the SIOP model with technology for developing secondary school EFL teachers' effective teaching skills and language achievement of first year secondary school students. The research followed the quasi experimental design. It included two samples ; the first was (20) first year secondary school teachers which participated as an experimental group. The other sample was 80 first year secondary school students who were divided into two equivalent groups ;90 students participated in a control group, the other 90 students participated as an experimental group. Materials of the research consisted of the SiOP model enhanced with technology, a training program for teachers based on the SIOP model enhanced with technology. Instruments of the research consisted of effective teaching observation sheet and language achievement test. Results of the study revealed the highly degree of effectiveness of the modified SIOP model enhanced with technology on both secondary school EFL teachers' effective teaching skills and students' language achievement.