Development of teaching materiaks is conducted because skor literasi sains sangat rendah. The purpose of the research was to find out the effectiveness of ethnosains-based teaching materials toward student’s activity. Model of the development was four-D model (devine,design, develop, and dessiminate). The research was focused on assessment phase where it was to observe the designed product effectiveness. The instrument was observation sheet. The observed activities conducted an observation of the student activities. Based on the result of the research, it is found that visual activities, learning activities, writing activities, the student’s activity is in the criteria very effective. It can be concluded that the use of discovery ethnosains-based teahing materials can increase the positive student’s activity and decrease the negative activity.