The A83 block and the X233 block are both shale oil plays in Changqing oilfield, both of which are typical low porosity, low permeability and ultra-low permeability reservoirs. The A83 block and the X233 block adopt the same volume stimulation method for production, but the output of the X233 block is significantly better than that of the A83 block. In response to this phenomenon, on the basis of analysis of production influencing factors, integrated such parameters as geological parameters based on logging interpretation data, geomechanical parameters based on rock mechanics experiments, engineering parameters for drilling and completion and fracturing operations, production characteristic data such as water content, and high pressure physical property parameters, Pearson's and Spearman's big data correlation analysis method was innovatively used to clarify the main controlling factors of production, and on this basis completes the research on the production difference of the two blocks. The results show that the geological parameters of the A83 block and the X233 block are basically the same, but there are obvious differences in the geomechanical parameters, water content, and dissolved gas-oil ratio, which are the main reasons for the difference in production. This method can be used to analyze the production difference and main control factors of Changqing shale oil plays, and can be popularized and applied to analyze the influencing factors of unconventional oil and gas production, so as to optimize the construction design and guide the field operation and production, which has certain reference significance.