Abstract: A deck and platform loca1 strength calculation software of nava1 surface ship has been de. signed based on the longitudinal strength virtual test system in this paper.Using the interface between XML document and test software database.the model data were successfully imported to test system. Through the process of“load calculation”.“deck plate strength calculation’’and “stiffeners strength calculation”.the software completed deck strength test based on naval rules.Software test results are consistent with that of the real ship calculation book verified manually.The software implements a man-machine interactive test interface and reduces largely computing time.