Oilfield Chemistry was founded in 1984. In those 40 years of trials and hardships，Oilfield Chemistry always put the quality of journal in the first place，and insisted on reporting the latest research progress，technological breakthroughs and application cases with high standards，which provided important scientific and technical support for the sustainable development of oil and gas industry. On the occasion of the 40th anniversary of Oilfield Chemistry，this editorial summarized the measures and effects taken to improve the quality and influence of the journal in recent years from the aspects of editing and publishing，digital construction，external communication and publicity，journal influence and awards. Starting at the age of 40，Oilfield Chemistry will keep in mind its original intention，base itself on the new era，keep improving the journal quality，and make greater contribution to the academic prosperity and scientific and technological innovation of oil and gas industry.