The aim of this study is to know the result of Discovery Based Learning Implementation through Improving Students' innovative thinking skills in solving open-ended task of pattern generalization. The method used in the study is a combination between quantitative and qualitative method called mixed method. Learning model of discovery based learning in the research manages to improve students' innovative thinking skills in solving open-ended task of pattern generalization indicated by the insignificant difference t-test score between the pre-test score of control class and experiment class [t (48) = -6.897, p > 0.005]. It results post-test score of control class 71.88 (SD = 5.944) and experiment class 83.88 (SD = 6.110). Hence, it indicates that both of the average post-test score are significant [(48) = -12.00, p < 0.005]. Discovery Based Learning (DBL) model in this study may improve students' innovative thinking skills to solve open-ended task based on the result of questionnaire and interview. In addition, students are able to observe, to find new patterns and to present what they obtain.