Abstract: A data analysis method includes steps of: obtaining at least one data table; wherein the data table includes a plurality of fields, and each of the fields stores field data; analyzing the field type according to the field data; determining a field category for each of the fields; calculating the similarity between the fields in different tables; determining the correlation between each of the fields according to the similarity; generating a field data description file according to the field type, the field categories and the correlations; and determining whether the field data description file is abnormal. A data analysis system is also disclosed.