The pellet target system, which is often used in hadronic physics experiments, is an internal target with 4coverage for reaction productions detection[1]. The pellet will interact with the circulating ion beam perpendicularlyin the reaction chamber. The precise determination of the reaction vertex is very helpful for the reconstruction ofthe events with short lived production particles. The pellet tracking system with other detectors can determinethe position of reaction vertex very precisely to an order of ten micrometer[2]. The pellet test station is beingconstructed at IMP, where the pellet tracking system is being built, and several experiments have been completedin IMP.