In order to achieve high current density in PEFCs, it is necessary to suppress the increase in concentration overvoltage caused by the liquid water in the gas diffusion layer (GDL), especially in substrate layer. This study aims to reduce the liquid water by removing the substrate layer to form by thin self-standing MPL which is made by specially arranged carbon mesh filled with carbon particles. Thickness of MPL is 50 mm to reduce oxygen transport resistance. Performance of the self-standing MPL was shown in the Fig.1. In-situ liquid water measurements using soft-Xray of self-standing MPL (Fig. (a)) and SGL-25BC (Fig. (b)) are compared. Self-standing MPL shows a drastic suppression of liquid compared with that of SGL-25BC.