Abstract: To meet the requirements of complex calculations with large amounts of data quickly,using the advantages of flexible operation of data sets by SQL language.Presents a calculation based on SQL data computing.Combined with the secondary development of the SQL and statistical computing modeling features of dam monitoring system,change the software computing by SQl computing directly,ultimately achieve the integration of data calculation.The results show that the application of new methods improve the system operational performance and computing speed,simplify the preparation of the algorithmand achieve the optimal development of the system.