In the field of condition monitoring and diagnosis,oil analysis method is needed for feature acquisition,but these instruments need to use their own software to view the data.In order to get rid of this constraint,a set of auxiliary format analysis methods and tools were designed,which uses API functions to obtain the position coordinates and specific contents of the controls in the instrument software form,then uses the relative relationship between the coordinates of the controls to determine its specific meaning,and takes the specific contents of the controls as the search value to automatically obtain the position of the characteristic values in the file.The tool can open the file generated by a specific analyzer in binary format,can extract four consecutive bytes from the binary file in turn,and can convert them according to the floating-point storage format.By comparing the converted value with the search value,the tool can output the storage location of the specific content in the file and analyze the storage format of the file.Taking the data of spectral analysis instrument as an example,the algorithm was tested and verified.It is shown that the algorithm is feasible and can correctly decompose the storage format of instrument data,which provides a new idea for file format analysis and information extraction.