Liaodong zone includes eastern actic region of Liaozhong sag and Liaodong uplift, which is between Liaozhong sag and Liaodong sag with good condition of source rocks and favorable reservoir-seal assemblages in Dongying formation. Meanwhile, there are many fault blocks and nose-shaped structures. However, twelve wells were drilled during 15 years without any significant business discovery by foreign oil companies and domestic petroleum enterprises before 2002. Based on deep research of geological condition and analysis on dry wells again in Liaodong zone, we recognized that two main reservoir plays existed at Dongying and Shahejie formation. Moreover, the dominative factor for Dongying is migration and the one for Shahejie is reservoir. According to this guidance, such giant oilfield JX1-1 was discovered with 150 million reserves in the end through right research direction and favorable targets evaluation, which shows great importance of scientific research in oil and gas exploration.