The present invention discloses an electrical connector assembly installed on a circuit board. The electrical connector assembly is characterized in that the electrical connector assembly comprises anelectronic module, an electrical connector which is installed on the circuit board and is used for electrically connecting the electronic module and the circuit board, and a support structure which is installed under the circuit board and is used for supporting the electrical connector, wherein a first direction and a second direction perpendicular to each other are defined by the electrical connector and are perpendicular to up and down directions, the support structure comprises a top surface facing the circuit board, the top surface comprises a raised part which has at least one first abutting portion and at least one second abutting portion for abutting the lower side of the circuit board, the raised part is set in the shape of a first arc passing the cross section of the at least onefirst abutting portion in the first direction, the raised part is set in the shape of a second arc passing the cross section of the at least one second abutting portion in the second direction, and the sizes of the first arc in a vertical direction is not equal to the size of the second arc in a vertical direction.