This research aims to improve student learning outcomes on ecology by implementing the Think Pair Share type learning strategy in class X Science at SMA Onate, Yapen Islands, Papua Province. The research method used is classroom action research. The subjects of this research were 25 class X Science students at Onate High School, Yapen Islands, Papua Province. This research was carried out in two cycles, and each cycle was carried out in 3 meetings. The research results showed that the recapitulation of learning outcomes in cycle I was 60%, or 15 students completed classical learning. In comparison, in cycle II, the percentage of student learning completion was 88%, or 22 students completed classical learning. Implementing the Think Pair Share type learning strategy can improve student learning outcomes in class X Science at SMA Onate, Yapen Islands, Papua Province.