The basic architecture of“Junyang 1”logging system is analyzed. The data post-processing program of the logging system is designed and developed based on Python. The operation parameter database of the suction harrow is established，and the visual display and interactive function of the data are realized. The algorithm based on time sequence and time is put forward to judge the working state of the suction harrowing vessel. Taking the Colombo Port City Development Project in Sri Lanka（2017—2018）as an example，the algorithm of the program was tested with statistical data of daily construction. The results show that the algorithm has good robustness.