The purpose of this study was to develop science essay writing activities for developing elementary pre-service teacher’s scientific thinking ability and scientific emotion and to analyze its effects. For the study, 60 first grade students attending teacher training institutes in the G region of Korea were selected. All 60 elementary pre-service teachers were students who selected a liberal arts lecture related to science inquiry . As a result of the study, we confirmed that the preliminary teacher uses the scientific method of induction in the article related to scientific thinking and the description related to the past time, agency, and purpose of the story is included in the essay related to scientific emotion. In addition, it was confirmed that elementary school teachers writing ability was improved as the writing was repeated, and that the image of science changed positively in many areas. This study suggests that a various and interesting scientific inquiry activities are needed to improve the science writing skills.