Ca2+　in　cardiac　myocyte　are　mainly　stored　in　the　sarcoplasmic　reticulum　(SR),　the　disturbance　of　Ca2+　dynamics　in　the　SR　can　cause　various　cardiovascular　diseases.　However,　there　is　a　lack　of　research　on　regulatory　mechanism　of　SR　Ca2+.　In　this　paper,　we　developed　a　spatially-detailed　numerical　model　for　Ca2+　blink　to　analyze　Ca2+　spatiotemporal　dynamic　characteristics　in　junctional　SR　(jSR)　cisternae　of　rabbit　cardiomyocytes.　The　geometric　model　is　constructed　by　2-dimensional　unstructured　triangular　meshes　with　a　combined　method　of　Delaunay　Triangulations　(DT)　and　Advancing　Front　Technique　(AFT).　The　numerical　method　for　solving　the　governing　equations　adopts　Basic　Function　Method　based　on　unstructured　triangular　meshes.　Finally,　our　model　is　well　reproduced　the　SR　Ca2+　kinetics　of　Ca2+　blink　and　simulated　results　well　match　the　results　of　a　recent　biological　experiment.　©　2023　SPIE.