The　rate-responsive　pacemaker　can　help　patients　recover　cardiac　chronotropic　function　and　adapt　to　different　daily　activities.　The　bioelectrical　impedance　technology　is　applied　to　predict　human　sinus　heart　rate　under　the　modulation　of　autonomic　nervous　system　and　has　demonstrated　high　reliability.　In　order　to　facilitate　scientific　research　and　improve　industrial　production　efficiency　of　pacemakers,　based　on　previous　studies　on　modeling　of　right　ventricular　impedance(RVI),　this　paper　designed　a　cardiac　bioelectrical　impedance　simulator,　including　impedance　generator　circuit,　microcontroller　and　graphical　user　interface(GUI).　The　designed　device　can　output　resistance　ranging　from　400　Ω　to　1100　Ω,　with　resolution　of　1　Ω　and　capacitance　from　1140　pF　to　1180　pF,　with　resolution　about　1.27　pF.　It　can　simulate　the　change　of　RVI　and　meet　the　demand　for　practical　application.　©　2019　IEEE.