Owing to increasing social demand for the reduction of CO2, fuel-efficient cars gain more attention than ever. Advanced High Strength Steels (AHSS) have successfully decreased the weight of cars, and eventually increased the fuel efficiency. Dual phase high strength steel (DP-HSS) is one of the AHSS. However, DP-HSS has a problem to form nanometer-sized oxides on the surface during the annealing process. The surface oxides were identified MnxSiyOz oxides. Since these oxides show poor wettability by liquid zinc alloys, uncoated bare spots are found on the steel surface after hot-dip galvanizing. In this study, wettability of the DP-HSS by liquid Zn-0.23wt%Al was investigated. For the dynamic reactive wetting experiments, a lab-made dispensed drop test machine was used. In order to investigate the wetting behavior of the DP-HSS Si content was fixed at 0.12wt% and different Mn content varied from 1.8 to 2.6wt%. The DP-HSS were annealed in a galvanizing simulator under 15%H2-N2 atmosphere. After annealing, surface oxides were analyzed with SEM and TEM. The wetting experiments were conducted at 450oC by dropping a drop of liquid zinc alloy onto the substrate under a purified hydrogen atmosphere. Initial contact angle for the three samples at different Mn content of 1.8, 2.2, 2.6wt% were estimated to be 104, 107, and 113o, respectively. The 2.6wt% Mn steel shows worst initial wettability. SEM analysis shows that the fraction of surface oxides was slightly increased by Mn concentration. It was founded the initial wetting behavior of dual phase high strength steel was affected by surface oxides fraction. As the interfacial chemical reactions proceed between liquid zinc alloy and steel plates, the contact angle between the DP-HSS and by liquid Zn-0.23wt%Al gradually deceased. The contact angle slightly decreased at the initial for 1s and did not change with time for hundreds seconds and then decreased again gradually. According to chemical reaction, the 1.8wt% Mn steel shows worst wettability. TEM analysis shows that the fraction of MnO oxide was increased by increasing Mn concentration. It could be explained by the reduction of MnO by soluble aluminum. Consequently, the initial wetting behavior of DP-HSS was affected by the surface oxides fraction. On the other hand, after chemical reaction occurred, the wetting behavior was affected by sort of the surface oxides.