An improved buoy structure includes a main target body with at least a recessed groove on its peripheral surface. The top of the main target body coaxially extends upward with a tail section, and at least a first mark is provided on the peripheral surface of the tail section. The tail section is provided with a capsule-shaped auxiliary target body. At least a second mark is arranged on the peripheral surface of the auxiliary target body. There is a difference between the auxiliary target body and the main target body. There is a standard foot section extending from the lower axis； when fishing, the main target body is completely submerged in the water, and some auxiliary target bodies are exposed on the water surface, so that the center of gravity of the buoy is moved downward, which can increase the overall stability of the buoy and is not easy When the buoy is placed in the water, the groove can guide the water flow. When the turbulence is relatively turbulent, it can maintain the balance of the buoy. When a living creature bites the bait, the auxiliary body is used as a capsule. It can reduce the sinking resistance of the buoy, allow the buoy to quickly sink into the water, and make it easy for a fisherman to determine the bait signal of the aquatic life.一種浮標結構改良，包含一主要標體，其周面至少環設有一內凹狀溝槽，該主要標體頂端向上同軸延伸有一標尾段，該標尾段周面至少環設有一第一記號，該標尾段設有一膠囊狀的輔助標體，該輔助標體周面至少環設有一第二記號，該輔助標體與該主要標體之間具有一段差，該主要標體底端向下同軸延伸有一標腳段；於垂釣時，該主要標體完全沉入水中，而部份的輔助標體露出水面上，令該浮標的重心下移，能增加該浮標的整體穩定度而不易搖晃傾斜；而當該浮標置於水中時，該溝槽可引導水流，遇到水流較湍急之處，也能保持該浮標的平衡；當一水中生物咬餌時，藉該輔助標體為膠囊狀，可降低該浮標的下沉阻力，令該浮標能迅速沉入水中，令釣者易於判斷該水中生物的就餌訊號。
