The Dandong 3000m scientific deep drilling project in Liaoning Province is the core task of the sub-project of the national key research and development plan “Demonstration of Deep Mineral Exploration and Storage in Liaodong/Jiaodong Ore Concentration Area”. This paper introduces the general situation of 3000m scientific deep drilling in Dandong， Liaoning Province and several key technologies. By adopting new tools such as HXY-8VB modified frequency conversion vertical shaft drill， lengthening drilling tool supporting anti-blocking inner pipe and quick fishing spear， the research and application of efficient diamond core bit were carried out， and the application of flow big data analysis and dynamic pretreatment system in deep geological drilling process was carried out. All drilling construction tasks were completed with high quality and high efficiency. It sets the record of the first deep hole in the exploration of non-coal solid minerals in eastern Liaoning. It provides a strong support for rerifing the metallogenic conditions ，evaluating gold resource potential below 3000m in this area and also provides technical references for extra-deep hole drilling construction.