About ICEENR2019 2019 4th International Conference on Energy, Environment and Natural Resources (ICEENR2019) (http://www.iceenr.com/2019/en/home) is a platform for academic communications between specialists and scholars in the fields of energy, environment and natural resources. ICEENR2019 will be held in Xi'an, China during May 27-29, 2019. Xi'an is the capital of Shaanxi Province, located in the northwest of China. Publication 2019 4th International Conference on Energy, Environment and Natural Resources (ICEENR2019) accepts original and unpublished papers. Both Full paper and Abstract are welcomed. Full papers accepted by the conference will be published online in the following journals of Science Publishing Group (http://www.sciencepublishinggroup.com). The journals have been indexed and abstracted by WorldCat, CrossRef, Electronic Journals Library, CNKI, Zeitschriftendatenbank, EZB, ResearchBib, Polish Scholarly Bibliography, Wissenschaftszentrum Berlin, etc. Journal of Energy and Natural Resources (JENR) http://www.sciencepublishinggroup.com/j/jenr ISSN Print: 2330-7366 ISSN Online: 2330-7404 American Journal of Energy Engineering (AJEE) http://www.sciencepublishinggroup.com/j/ajee ISSN Print: 2329-1648 ISSN Online: 2329-163X International Journal of Environmental Monitoring and Analysis (IJEMA) http://www.sciencepublishinggroup.com/j/ijema ISSN Print: 2328-7659 ISSN Online: 2328-7667 Science Discovery (SD) http://www.sciencepublishinggroup.com/j/sd ISSN Print: 2331-0642 ISSN Online: 2331-0650