The purpose of this community service activity is to provide knowledge and practical science skills to support the National Science Olympiad (OSN) activities for teachers at SDN I Airlangga Surabaya and its surroundings. Based on the questionnaire distributed to the teachers of the SDN I Airlangga Surabaya, it showed that most of the teachers (87%) had never carried out practicum or experimental activities to support the OSN of Science at school. One of the targets to be achieved through this activity is to change attitudes and to increase the knowledge and skills of the SDN I Airlangga Surabaya teachers who have skills in science practicum to support OSN. The training was conducted using lecture methods, slides and videos, question and answer, interactive dialogue, brainstorming and work practices. There are three things that the partners got after holding the training, namely a) Knowledge; it seems that participants have gained new knowledge about the implementation of elementary science practicums after the training, b) Skills; participants seem to have had the skills to carry out practical science activities of elementary school, c) Attitude (behaviour); according to the practicum activities carried out, scientific attitudes were formed by the participants in supporting science olympic activities. In implementing the training, the partners generally have a great willingness and interest to participate on the training.