The Sumatran tiger conservation faces the threat of poaching and illegal trade, which results in the death of protected wildlife. A number of online media have taken notice to these cases. This study aims to determine the pattern of issue emphasis, selection of sources, and the intensity of reporting on Sumatran tiger conservation conducted by Kompas.com, Tribunnews.com and Mongabay.co.id during the period of 2015-2018, using the Zhongdang Pan and Gerald M Kosicki model of framing analysis method. The results showed that in the pattern of issue emphasis, the three media emphasized the law enforcement aspect and the chronology of events, while conservation aspects were less prominent. Kompas.com and Tribunnews.com did not address the court process, while Mongabay.co.id raised the issue with an emphasis on being critical of the court's demands and verdicts in terms of Law Number 5 of 1990. In regards to the pattern of selection of sources, Kompas.com and Tribunnews.com tends to interview authorities as the main source, while the Sumatran tiger conservation NGO have less place in the news. Meanwhile, Mongabay.co.id is more balanced in interviewing officials and NGOs. Apart from being the main source, the authorities play a role in persuading the public to participate in the efforts of Sumatran tiger conservation, while NGOs are more critical of the weak law enforcement. As for the pattern of reporting intensity, the news on Kompas.com and Tribunnews.com stopped at the stage of law enforcement and the discussion of conflicts between Sumatran tigers and humans. This is contrary to the principles of environmental journalism, namely the sustainability of reporting. Meanwhile, Mongabay.co.id provides a more complete and balanced coverage.