The contact angle is the most important parameter in the application of SFE theory (a reliable method to evaluate water damage of asphalt mixture). The column wick method is an efficient and reliable method for measuring the contact angle of mineral powders, if the measurement steps are standardized. This paper optimized the parameters that can affect the contact angle measurement by the column wick method to solve the problem of poor reproducibility of experimental results due to the non-standardization of the measurement steps. Firstly, a set of column wick method apparatus was developed to ensure the accuracy and consistency of the measurement. Secondly, there were some factors selected as the influencing factors of the contact angle measurement results, such as particle size of aggregate powder, vibration time, different polarity impregnation solution and aggregate acidity and alkalinity. The vibration time affected the density of the mineral powder, the particle size affected the effective particle size, and the capillary permeability, on the other hand, was affected by the acidity and alkalinity of the aggregate and the different polarity of the impregnating solution. Finally, the results of measuring the contact angle of the same type aggregate by column wick method and sessile drop method were compared. The results showed that when the contact angle of the aggregate was measured by the column wick method, the best contact angle was obtained when the particle size was 0.04-0.075 mm, the vibration time of the mineral powder was 6 minutes. Chloroform, diiodomethane and formamide were used as impregnating liquids, with a maximum error of only 16.97°, which is only 0.34 times that (49.26°) of the sessile drop method. Through optimization, the column wick method measured the contact angle with high accuracy and reproducibility.