NOVELTY - The porous support with directional mechanical properties comprises polymer nanofibers that are randomly arranged, and hydrocarbon-based polymer that is insoluble in organic solvents. The polymer nanofibers are produced by solidifying and electro-spinning the polymer precursor solution by alternatively transferring multiple upper and lower rollers having a winding tension of 1-15 N under zigzag condition and then continuously curing. The directional mechanical properties are tensile strength and elongation. The porous scaffold has a porosity of 50-90%, and an average thickness of 5-50 mu m.    USE - The porous support is useful in a reinforced composite membrane for a fuel cell.    ADVANTAGE - The porous support exhibits improved directional mechanical properties including tensile strength and elongation, improves dimensional stability, melting point, chemical resistance and heat resistance and durability of the membrane, and can minimize the resistive loss of the composite membrane.    DETAILED DESCRIPTION - The porous support with directional mechanical properties comprises polymer nanofibers that are randomly arranged, and hydrocarbon-based polymer that is insoluble in organic solvents. The polymer nanofibers are produced by solidifying and electro-spinning the polymer precursor solution by alternatively transferring multiple upper and lower rollers having a winding tension of 1-15 N under zigzag condition and then continuously curing. The directional mechanical properties are tensile strength and elongation. The porous scaffold has a porosity of 50-90%, an average thickness of 5-50 mu m and a dimensional stability of less than or equal to 8% in a one-way direction expanded in water after the ion conductor was dipped. The tensile strength ratio of a vertical direction about the one-way direction and one-way direction of the support is less than or equal to 5. The elongation ratio of the vertical direction about the one-way direction and one-way direction of the support is greater than or equal to 0.2. An INDEPENDENT CLAIM is included for a method for manufacturing a porous support.