A plug connector, comprising: a conductive body, having an assembling hole; an insulative body, sleeved on the conductive body, wherein an end portion of the insulative body has an opening hole and the assembling hole is aligned with the opening hole; and a ring shape conductive terminal, assembled in the assembling hole, wherein the ring shape conductive terminal comprises a conductive inner ring, a first conductive outer ring and a second conductive outer ring arranged side by side and configured to be in contact with the conductive body; wherein the conductive inner ring is located between the first conductive outer ring and the second conductive outer ring, the first conductive outer ring has an inner end adjacent to the conductive inner ring, and the second conductive outer ring has an inner end adjacent to the conductive inner ring, the conductive inner ring includes a plurality of conductive portions arranged circularly, each of the conductive portions has at least two conductive contacts configured to be in contact with a mating terminal of a mating connector, and each of the conductive portions is connected to the first conductive outer ring and the second conductive outer ring; and wherein the ring shape conductive terminal has a plurality of trenches, and the trenches are arranged circularly, and the two conductive portions adjacent to each other are separated by one of the trenches, each of the trenches has a first end adjacent to the first conductive outer ring and a second end adjacent to the second conductive outer ring, and the first end and the second end are opposite to each other, wherein the first end of each of the trenches keeps a distance from the inner end of first conductive outer ring, and the second end of each of the trenches keeps a distance from the inner end of the second conductive outer ring, and the plug connector further comprises a sleeve, sleeved on the insulative body, wherein the end portion of the insulative body has an end surface and a side surface connected to the end surface, the end surface is not flush with a surface of the sleeve that is parallel to the end surface of the end portion of the insulative body, and the side surface of the end portion of the insulative body is exposed from and passes through the sleeve. a conductive body, having an assembling hole; an insulative body, sleeved on the conductive body, wherein an end portion of the insulative body has an opening hole and the assembling hole is aligned with the opening hole; and a ring shape conductive terminal, assembled in the assembling hole, wherein the ring shape conductive terminal comprises a conductive inner ring, a first conductive outer ring and a second conductive outer ring arranged side by side and configured to be in contact with the conductive body; wherein the conductive inner ring is located between the first conductive outer ring and the second conductive outer ring, the first conductive outer ring has an inner end adjacent to the conductive inner ring, and the second conductive outer ring has an inner end adjacent to the conductive inner ring, the conductive inner ring includes a plurality of conductive portions arranged circularly, each of the conductive portions has at least two conductive contacts configured to be in contact with a mating terminal of a mating connector, and each of the conductive portions is connected to the first conductive outer ring and the second conductive outer ring; and wherein the ring shape conductive terminal has a plurality of trenches, and the trenches are arranged circularly, and the two conductive portions adjacent to each other are separated by one of the trenches, each of the trenches has a first end adjacent to the first conductive outer ring and a second end adjacent to the second conductive outer ring, and the first end and the second end are opposite to each other, wherein the first end of each of the trenches keeps a distance from the inner end of first conductive outer ring, and the second end of each of the trenches keeps a distance from the inner end of the second conductive outer ring, and the plug connector further comprises a sleeve, sleeved on the insulative body, wherein the end portion of the insulative body has an end surface and a side surface connected to the end surface, the end surface is not flush with a surface of the sleeve that is parallel to the end surface of the end portion of the insulative body, and the side surface of the end portion of the insulative body is exposed from and passes through the sleeve.