Abstract: Oil gas drilling is faced with many new challenges in 21st century.Selection of oil gas drilling core Technologies is very important to scientific and reasonably lay out our science and technology development strategy in oil gas drilling.Considering the strategy aims of our land petroleum development,this paper established a technical evaluation index system for evaluating oil gas drilling core technologies.Ideal point method of system engineering is applied to evaluate oil gas drilling core technologies.According to the value of priority factor,oil gas drilling core technologies are sorted.