Peer review refers to the invitation of experts and scholars in related fields to evaluate the content of a manuscript to judge its academic value.This process is not only an important means to maintain the academic quality of academic journals but also an important link to ensure the normal operation of academic journals.The editorial office of Petroleum Geology and Recovery Efficiency implements a three-stage review system, i.e. initial review by the editor, review by peer experts, and final review by the editor-in-chief (editorial committee). Before the manuscript is submitted for review, relevant information such as the author's name, employer, fund sponsorship will be deleted, so that all review procedures are covered by double blind review which is detailed as follows:

1. Initial review by editor

The manuscript will be initially reviewed with respect to the topic selection and academic level. manuscripts that meet the requirements of this journal will be subject to expert review process and those fail will be rejected.

2. Review by peer expert

The manuscript will be reviewed with respect to the content details like originality, academic level and preciseness by 2 peer experts who will then comment the manuscript for the author's reference.

3. Final review by editor-in-chief (meeting on final version of the journal)

The chief editor organizes the deputy chief editor and the responsible editor to hold the meeting on final version of the journal regularly to adopt the manuscript or reject it for revision and re-review based on the peer review's and the editor's opinions. If the opinion of manuscript is controversial, the reviewer shall be selected again for review, and the final review conclusion shall be made according to the specific review opinions.

                                                                                  The editorial office of Petroleum Geology and Recovery Efficiency