Abstract: According to constitution elements of natural gas loss for underground gas storage,statistical analysis on constitution proportions of natural gas loss for underground gas storage is made,in which the loss of cushion gas covers a high proportion,accounting for 96.86% of total gas loss volume.Research on gas loss data from 6 injection/extraction periods of some underground gas storage is made.Results show that relationship between total accumulated gas loss volume and accumulated gas injection volume accord with exponential relation.Regression formula is adopted to predict gas loss volume for some underground gas storage in coming decade and variation law of gas loss ratio is analyzed.It is considered that the research conclusion is of coaching significance in improving operation productivity and management level of underground gas storage.