The purpose of the study is to explore the types and coping methods of dilemmas that pre-service science teachers experience during student teaching. For this, we collected 131 dilemma journals that 34 pre-service science teachers wrote during a four-week period of student teaching. Results show that first, there are five categories of dilemmas, they are, 'Which science teacher should I be?', 'What is good science teaching?', 'How should I build relationships with the people around me at school?', and 'Who am I as a student teacher?'. Second, pre-service science teachers' status as a students-teachers made them cope with dilemmas passively. Third, when they cope with the dilemmas, student-teachers considered the dilemmas as conflicts of irreconcilable alternatives rather than opportunities of conciliation and compromise, therefore, most pre-service science teachers choose just one alternative and only 20% of dilemmas are resolved by compromise choice. Finally, dilemmas which showed the features of science teaching are the dilemmas related to scientific inquiry teaching and science teaching-learning model. Based on the results, we discussed the implications for teacher education.