A support apparatus , wherein the support apparatus comprises a stylus fastener , the stylus fastener is configured to fasten a stylus , a magnet of the stylus comprises a first wall surface and a second wall surface facing away from the first wall surface , and a polarity of the first wall surface is opposite to that of the second wall surface , the stylus fastener comprises an annular body and a mounting space formed by the body , the body is magnetic and comprises an inner wall surface and an outer wall surface , the inner wall surface faces the mounting space , the outer wall surface faces away from the inner wall surface , the inner wall surface has a first polarity, the outer wall surface has a second polarity, and the first polarity is opposite to the second polarity; and the stylus is mounted in the mounting space in an X-axis direction, so that the stylus fastener is sleeved onto a periphery of the stylus , and the X-axis direction is a length direction of the support apparatus ; and both the first wall surface and the second wall surface are disposed opposite to the inner wall surface , characterised in that a first magnetic force is generated between the first wall surface and the inner wall surface , a second magnetic force is generated between the second wall surface and the inner wall surface , and the first magnetic force and the second magnetic force have a difference, so that the stylus can be magnetically fastened to the stylus fastener by using the magnet, wherein in a direction around the X axis, the inner wall surface of the body comprises a first area and a second area , and a density of magnetic lines of the first area is higher than that of the second area; and wherein, in the direction perpendicular to the X axis, the first wall surface is opposite to a part of the first area or the entire first area , and the second wall surface is opposite to a part of the second area or the entire second area, and wherein the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force. the stylus is mounted in the mounting space in an X-axis direction, so that the stylus fastener is sleeved onto a periphery of the stylus , and the X-axis direction is a length direction of the support apparatus ; and both the first wall surface and the second wall surface are disposed opposite to the inner wall surface , characterised in that a first magnetic force is generated between the first wall surface and the inner wall surface , a second magnetic force is generated between the second wall surface and the inner wall surface , and the first magnetic force and the second magnetic force have a difference, so that the stylus can be magnetically fastened to the stylus fastener by using the magnet, wherein in a direction around the X axis, the inner wall surface of the body comprises a first area and a second area , and a density of magnetic lines of the first area is higher than that of the second area; and wherein, in the direction perpendicular to the X axis, the first wall surface is opposite to a part of the first area or the entire first area , and the second wall surface is opposite to a part of the second area or the entire second area, and wherein the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force. <EOS>