Deep shale gas（buried depth>3 500 m） is the potential resource for future exploration in Sichuan Basin.Although the industrial shale gas flows have been obtained at the depth of 3 500～4 000 m in Wufeng-Longmaxi Formation of Sichuan Basin

the commercial development hasn’t been put into practice due to the rapid decline and the low EUR（Estimated Ultimate Recovery）.Based on the analysis of the current status of shale gas exploration and development

the challenges in the deep shale gas development with high efficiency and large scale in Sichuan Basin have been summarized

mainly in the following aspects:the understanding of occurrence mechanism and enrichment law of deep shale gas needs to be deepened

engineering and technology of economical and effective fracturing treatment need to be established

and the organizational operations and management methods of deep shale gas development are difficult to meet the needs of the large-scale and high efficient development.Three countermeasures are proposed to realize the large-scale and highly efficient development of deep shale gas:①deepening the understanding of deep shale gas enrichment laws

establishing the methods of area selection and evaluation

and forming the prediction and description technologies of "sweet spot" and "sweet window";② deepening the research on the geological conditions of deep shale gas

forming an advanced supporting technology of drilling and fracturing and an equipment system to fully release the reservoir capacity;③promoting the geology-engineering integration

building a new system and mechanism

and greatly reducing the cost to maximize the development benefits of deep shale gas.The industrial gas flows have been obtained in several wells at the depth of more than 3 500 m in Wufeng-Longmaxi Formation in Sichuan Basin and the proven reserves have been submitted.It is the key and priority stratum of the deep shale gas development.By deepening the geological understanding

overcoming the key technical problems

and improving the management system

it can significantly accelerate the speed

reduce the cost

increase the efficiency and achieve a large-scale and highly efficient development in a relatively short period.The output is expected to be higher than that of the middle and shallow shale gas reservoir.