Lake Rawa Pening comes from a spring that comes out of the swamp, besides that there are several rivers that empties into Rawa Pening, including: Galeh River, Torong River, Panjang River, Muncul River, Parat River, Legi River, Pitung River, Praginan River And the Rengas River. There are three problems that cause damage to the Rawa Pening Lake ecosystem, namely damage to the water catchment area, damage to the lake border, and water pollution. This study aims to analyze Dissolved Oxygen (DO) and Biological Oxygen Demand (BOD) spatially and temporally due to damage to the lake ecosystem. The method used is Inverse Distance Weighted (IDW), where 12 sample point locations were taken, there were 10 sample points representing each village (lake inlet and utilization) and 2 sample points representing the center and outlet of the lake. The average DO yield in September 2020 was 6.8 mg / L, then in October 2020 it was 4.65 mg / L and in November 2020 it was 3.04 mg / L. Then the average BOD in September 2020 was 3.16 mg / L, then in October 2020 it was 2.6 mg / L and in November it was 1.53 mg / L, so it can be seen that the DO variable and BOD both decreased from September to November 2020.