| Presently, the reformation of the towing tank in Wuhan University of Technology was already complicated. It is part of necessary post-construction work to analyze the influence of various error sources to the resistance experiment, to estimate the uncertainty of test results caused by synthetic errors, to find out error sources which influence the result most and to put forward measures to improve accuracy. The main course of above-mentioned work follows the recommendation by ITTC RC. This work is not only the ITTC member's duty, but also of importance in enhancing the accuracy and efficiency in towing tank experiment.First, by the uncertainty analysis method which ITTC RC recommended in 2002, an overall analysis and summary on the resistance experiment in towing tank and the result of uncertainty analysis concerned has made to find out the influence of equipment deviation in towing tank test to measurement result and the biggest error margin source. We can make possible improvement, based on this analysis, in test equipment and means to reduce measuring errors.Then, the uncertainty analysis on the measuring method, calculation method and the test data are presented respectively. The main factors which influence accuracy of the longitudinal-cut method in wave-profile measuring test are found out. A scheme to reduce uncertainty and enhance accuracy in given experiment conditions is recommended.At last, employing the result of this research, a system for wave profile measuring and wave profile analysis is developed to improve the accuracy in relevant experiment and the efficiency of equipment.
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