This study analyzed the scientific creativity on Cognitive-Furthering stage activities according to methods of assessment in science outdoor learning by a brain-based evolutionary approach. The brain-based evolutionary approach was originally developed based on the human brain structure and function involved in scientists’ activities and the evolutionary attributes of the science itself and the brain functions. Samples of the study were composed of 3 classes of sixth graders(67) of N elementary school in Seoul, Korea. The comparison group used textbook- based and teachers’ guidebook-based instruction. Experimental group A learned by a brain-based evolutionary approach, and Experimental group B learned science outdoors and in the classroom through the brain-based evolutionary approach. The major results of the study are as follows. First, for test of scientific creativity, a statistically significant difference among comparison group and experimental groups was not found. When the assessment standard was given to the assessors, the standard deviation of scientific creativity of the students decreased. Second, according to the students’ self assessment scores, 7.4% of them believed that creativity comes from originality. In contrast, 5.9% of the students believed creativity comes from being useful to all in life. The rest of the students believed that originality and being useful in life are two important characteristics that are needed in order to fulfill scientific creativity. Third, The students’ self assessment scores on originality and scientific creativity also showed a statistically significant difference among the students who showed a high level of interest, the students who showed a medium level of interest and the students who showed a low level of interest. In the teachers’ assessment of originality, a statistically significant difference was found among the students who received high, medium and low achievement scores. On the basis of the results, the implications for the research in scientific creativity and the science teaching and learning in school are discussed.