Mathematical resilience is an internal factor in students that is important to have in dealing with learning mathematics. This study aims to design efforts to construct mathematical resilience and develop sainsmatika-based teaching materials in constructing students' mathematical resilience. The research method used is the design method ("design research") with a qualitative approach. The design of this study uses the model proposed by Plomp and Nieveen (2007) which includes "preliminary research," namely analyzing the level of students' mathematical resilience, conducting a literature review, and developing a conceptual or theoretical framework for research. "Prototyping stage," the process of designing teaching materials that is developed repeatedly is the design of the Pythagorean module based on sainsmatika. The last is the "assessment phase," by evaluating the extent to which the modules designed provide solutions in constructing students' mathematical resilience. The validation results show that the module category is at a very feasible level for use with a percentage of 89.84%, covering aspects of content feasibility assessment of 92.43%, presentation feasibility of 91.66%, language feasibility of 84.25%, and assessment of sainsmatika elements. by 91.68%. So that the module that has been designed is very feasible to use as a form of constructing students' mathematical resilience.