Nowadays, measuring crude oil water content information accurately and rapidly is important to the oil industry. However in practice, there are many factors need to be considered, therefore it is difficult to judge which measurement is the most appropriate and effective one. In this paper, we apply the AHP method for judging the most appropriate measurement considering all the factors. Moreover according to the decision result of the AHP method, we design the prototype measurement system for experimental analysis. The experimental results indicate that the measurement that AHP method screens is superior.