The mechatronics hydrausic service system is a typical mechatronics system , and the logarithmic frequency method is the chief design method with which the stability of the system can be obtained, the range of the stability as well as the frequency width can be calculated, the dynamic design can be made.

Reservoir flood season staging calculation is conducted based on annual maximum sampling and super-quantitative sampling through using vector statistics and relative frequency methods,and compared with other methods currently in use.