Dielectric　elastomers　are　emerging　electro-active　materials　used　in　high-performance　actuators.　The　dielectric　and　mechanical　properties　are　key　parameters　which　determine　their　electromechanical　coupling　applications.　Firstly,　the　dielectric　constant　and　elastic　modulus　of　a　representative　elastomer　(VHB4910)　are　investigated　by　experimental　analysis,　and　then　the　influence　of　these　properties　on　the　electromechanical　coupling　properties　is　analyzed.　It　is　found　that　the　actuator　properties　are　dominated　by　the　elastic　modulus　of　the　elastomer,　which　is　frequency　and　temperature　dependent,　and　the　changes　caused　by　it　may　be　up　to　four　orders　of　magnitude;　while　the　dielectric　constants　has　a　relative　minor　effect　on　the　actuator　behavior.