Disclosed are an upper casing of an outer casing of a handheld computer and a manufacturing method thereof. The upper casing is combined by
magnesium aluminum
alloy materials and plastics, and is made of high-quality
magnesium aluminum
alloy materials which are casted or pressed into a
magnesium aluminum
alloy panel with curved edges at the surrounding. After going through passivating treatment, the magnesium aluminum alloy panel is placed in a plastic die of the upper casing of the outer casing of the handheld computer to inject through a
hot pressing injection
machine, thereby enabling the periphery of the magnesium aluminum alloy panel to be stably combined with plastics to form a semi-finished product. The semi-finished product is manufactured into the upper casing of the outer casing of the handheld computer which is combined by the magnesium aluminum alloy materials and the plastics after scientific
polishing and finishing. The upper casing of the outer casing of the handheld computer which is manufactured by combining the characteristics of the magnesium aluminum alloy materials and the plastics achieves the communication effect of
pressure resistance, strong
impact resistance, not being easy to deform, and not affecting
wireless operation, meets the requirements of modern information society, overcomes shortages of non-pressure-resistance, non-wear-resistance and easy deformation of the outer casing of the plastic outer casing of the handheld computer, and also overcomes the shortage that the outer casing of the handheld computer manufactured by the integral magnesium aluminum alloy materials affects
wireless operation.