Among  fiber  reinforced  plastic  (FRP)  composites,  carbon  FRP  (CFRP)  is  commonly  used  in  the  form  of  grids for  both  internal  and  external  reinforcement  in  reinforced  concrete  structures.  However,  existing  performance  evaluation standards for CFRP grids are inadequate, necessitating the adoption of standards intended for FRP reinforcement bars. This study aims to address this gap by evaluating the tensile performance of CFRP grids by considering various variables, such as the number of grid strands and type of filling materials within the tubes. Tensile tests were carried out on CFRP grids comprising  1, 2,  and  3 strands,  and the  filling materials  tested included  mortar,  epoxy,  and  a  combination of  epoxy and mortar.  Based  on  the  results,  which  identified  the  optimal  number  of  strands  and  filling  materials,  further  tests  were performed  to  assess  the  tensile  performance  of  CFRP  grids  under  varying  high-temperature  exposure  durations.  The temperature was consistently maintained at 130℃, with five specimens subjected to high temperatures for 70 min (Case 2), 100 min (Case 3), 120 min (Case 4), and 150 min (Case 5). These were compared with specimens that were not exposed to  high  temperatures  (Case  1).  The  experimental  results  showed  that,  compared  with  specimens  not  exposed  to  high temperatures, the tensile strength and modulus of elasticity in Case 5 decreased by up to 51.32% and 44.4%, respectively.