The aim of this study is examining the effect of the using scientific literacy development activities on students' achievement. The study was carried out in a primary school in Buca Izmir for 2010-2011 academic years. System of our body was chosen as a study topic in our search which took 6 weeks. Pre-post test semi experimental control model was used as an experimental pattern. While activities improving scientific literacy were being applied for experiment group; science and technology curriculum was applied for control group. As a result of the study, the experimental group achievement was measured higher than the control group. Consequently it was seen that using scientific literacy development activities in science and technology lessons increases the student achievement. (Contains 4 tables.)