Abstract: Based on the opportunities and challenges facing petroleum and natural gas enterprises due to climate change，and considering relevant experiences of foreign petroleum enterprises，this article points out that it is necessary to explore low carbon economy mode in order to solve the problems of high energy consumption and high pollution and to promote sustainable development of petroleum and natural gas enterprises. From the perspective of ecological ethics，this paper starts from the application of low carbon economy and low carbon technology to petroleum and natural gas enterprises. And through analysis of evaluation index of the low carbon enterprises，the author intends to explore the approaches to low carbon economy the petroleum natural gas enterprise may adopt.

Key words: petroleum and natural gas enterprises, ecological ethics, lowcarbon economy