A method for machining metallic member using lathing and milling, comprising: providing a machine comprising a machine support, a worktable, a moving device, a lathe feeding mechanism, and a milling feeding mechanism, wherein the worktable is positioned on the machine support; the moving device is slidably assembled to the machine support along a first direction and located above the worktable, the lathe feeding mechanism and the milling feeding mechanism are slidably assembled to the moving device along a second direction perpendicular to the first direction, the lathe feeding mechanism comprises at least one feeding assembly and a lathe tool connected to the at least one feeding assembly, the at least one feeding assembly is configured for driving the lathe tool to move along a third direction substantially perpendicular to the first and second direction reciprocally, the milling feeding mechanism comprises a milling cutter and is configured for driving the milling cutter to move along the third direction; positioning a metallic member on the worktable, the metallic member comprising a top portion with a three dimensional curved surface and a peripheral sidewall extending from a peripheral edge of the top portion, the peripheral sidewall comprises a plurality of side surfaces arranged in order and adjacent two of the plurality of side surfaces is connected by a corner; applying the worktable to rotate the metallic member around a first axis parallel to the third direction; controlling the lathe tool to move backwards and forwards at a high speed along the third direction to machine the top portion with the three dimensional curved surface of the metallic member circumferentially; moving the lathe tool by the moving device along a predetermined path relative to the worktable to machine the three dimensional curved surface of the top portion of the metallic member; holding the metallic member to stop rotate, and moving the lathe tool away from the metallic member; driving the milling cutter to rotate, and to resist the peripheral sidewall of the metallic member; and moving the milling cutter along a predetermined path, simultaneously controlling a feed of the milling cutter relative to the metallic member, when the milling cutter finishes milling one side surface, the milling cutter arrives at one corner of the peripheral sidewall, the moving device drives the milling feeding mechanism to move along the first direction and the second direction, simultaneously rotating the metallic member with the worktable, thereby cooperatively adjusting a position of the milling cutter relative to the metallic member, until the milling cutter arrives at an adjacent side surface to the side surface that has been milled. providing a machine comprising a machine support, a worktable, a moving device, a lathe feeding mechanism, and a milling feeding mechanism, wherein the worktable is positioned on the machine support; the moving device is slidably assembled to the machine support along a first direction and located above the worktable, the lathe feeding mechanism and the milling feeding mechanism are slidably assembled to the moving device along a second direction perpendicular to the first direction, the lathe feeding mechanism comprises at least one feeding assembly and a lathe tool connected to the at least one feeding assembly, the at least one feeding assembly is configured for driving the lathe tool to move along a third direction substantially perpendicular to the first and second direction reciprocally, the milling feeding mechanism comprises a milling cutter and is configured for driving the milling cutter to move along the third direction; positioning a metallic member on the worktable, the metallic member comprising a top portion with a three dimensional curved surface and a peripheral sidewall extending from a peripheral edge of the top portion, the peripheral sidewall comprises a plurality of side surfaces arranged in order and adjacent two of the plurality of side surfaces is connected by a corner; applying the worktable to rotate the metallic member around a first axis parallel to the third direction; controlling the lathe tool to move backwards and forwards at a high speed along the third direction to machine the top portion with the three dimensional curved surface of the metallic member circumferentially; moving the lathe tool by the moving device along a predetermined path relative to the worktable to machine the three dimensional curved surface of the top portion of the metallic member; holding the metallic member to stop rotate, and moving the lathe tool away from the metallic member; driving the milling cutter to rotate, and to resist the peripheral sidewall of the metallic member; and moving the milling cutter along a predetermined path, simultaneously controlling a feed of the milling cutter relative to the metallic member, when the milling cutter finishes milling one side surface, the milling cutter arrives at one corner of the peripheral sidewall, the moving device drives the milling feeding mechanism to move along the first direction and the second direction, simultaneously rotating the metallic member with the worktable, thereby cooperatively adjusting a position of the milling cutter relative to the metallic member, until the milling cutter arrives at an adjacent side surface to the side surface that has been milled.