Abstract: Regarding the new discoveries and breakthroughs in tight oil and gas exploration in Ordos basin，Sichuan basin，Songliao basin and Junggar basin，reserves and productions increased rapidly，and tight oil and gas is considered to be the most practical unconventional hydrocarbon resources.Based on the summarizing of new advances in exploration，resources assessment of tight oil and gas in 10 major basins was carried out by using seven methods.According to the assessment，tight oil and gas resources in-place are respectively estimated at 14.66 billion tons and 22.88 trillion cubic meters，and recoverable tight oil and gas resources are respectively estimated at 1.455 billion tons and 11.26 trillion cubic meters.The assessment indicates that tight oil and gas is abundant in China and has a great potential for exploration.Considering the both the challenges and opportunities，there will be a good prospect for tight oil and gas exploration.