A virtual reality tracking system (TR), comprising: a first part (PA), comprising: a plurality of first light-emitting diodes ; and an inertial measurement unit (IMU), configured to measure an acceleration and a triaxial angular velocity of the first part; and a second part (PB), comprising: a plurality of second light-emitting diodes ; wherein the first part and the second part are connected by a flexible component ; wherein the inertial measurement unit transmits the acceleration and the triaxial angular velocity to a head-mounted display device through a transmission interface; a head-mounted display device; a first camera (CAM1) on the head-mounted display device captures the first light-emitting diodes on the first part (PA) to generate a plurality of first images; and the head-mounted display device calculates a first pose of the first light-emitting diodes in three-dimensional space through the first images, the acceleration, and the triaxial angular velocity; wherein the second camera (CAM2) on the head-mounted display device captures the second light-emitting diodes on the second part PB() to generate a plurality of second images; and the head-mounted display device calculates a second pose of the second light-emitting diodes in three-dimensional space using the second images; and wherein a first coordinate system of the first pose corresponds to the first camera (CAM1); wherein a second coordinate system of the second pose corresponds to the second camera (CAM2); the first coordinate system is different from the second coordinate system. a first part (PA), comprising: a plurality of first light-emitting diodes ; and an inertial measurement unit (IMU), configured to measure an acceleration and a triaxial angular velocity of the first part; and a plurality of first light-emitting diodes ; and an inertial measurement unit (IMU), configured to measure an acceleration and a triaxial angular velocity of the first part; and a second part (PB), comprising: a plurality of second light-emitting diodes ; a plurality of second light-emitting diodes ; wherein the first part and the second part are connected by a flexible component ; wherein the inertial measurement unit transmits the acceleration and the triaxial angular velocity to a head-mounted display device through a transmission interface; a head-mounted display device; a first camera (CAM1) on the head-mounted display device captures the first light-emitting diodes on the first part (PA) to generate a plurality of first images; and the head-mounted display device calculates a first pose of the first light-emitting diodes in three-dimensional space through the first images, the acceleration, and the triaxial angular velocity; wherein the second camera (CAM2) on the head-mounted display device captures the second light-emitting diodes on the second part PB() to generate a plurality of second images; and the head-mounted display device calculates a second pose of the second light-emitting diodes in three-dimensional space using the second images; and wherein a first coordinate system of the first pose corresponds to the first camera (CAM1); wherein a second coordinate system of the second pose corresponds to the second camera (CAM2); the first coordinate system is different from the second coordinate system. <EOS>