With　the　advancement　of　power　electronics,　power　electronic　devices　need　to　bear　the　operating　conditions　of　pulse　width　modulation　(PWM)　voltage　with　higher　frequencies,　higher　amplitudes,　and　steeper　pulse　rising　edges.　Epoxy　resin　is　extensively　applied　to　packaging　insulation　materials　due　to　its　significant　performance.　However,　its　insulation　performance　under　different　pulse　parameters　of　higher-frequency　PWM　waves　still　needs　further　research.　This　article　compares　and　investigates　the　effect　of　different　pulse　rise　times　on　the　electrical　tree　growth　characteristics　of　epoxy　resin　under　the　action　of　low-frequency　and　high-frequency　PWM　waves.　Research　has　found　that　high　frequency　can　promote　the　growth　of　electrical　tree.　Under　the　action　of　a　unipolar　square　wave　with　an　amplitude　of　12　kV　at　room　temperature,　the　growth　rate　of　the　epoxy　resin　electrical　tree　significantly　increases　when　the　frequency　rises　from　400　Hz　to　10　kHz.　At　high　frequency,　both　the　horizontal　and　vertical　growth　rates　of　the　electrical　tree　exhibit　a　nonlinear　growing　trend.　Meanwhile,　the　pulse　rise　time　has　a　significant　impact　on　the　morphology　of　the　electrical　tree.　At　low　and　high　frequencies,　there　is　a　significant　difference　in　the　morphology　of　the　electrical　tree　of　epoxy　resin　as　the　pulse　rise　time　increases.　However,　overall,　the　width　of　the　electrical　tree　channel　decreases　bit　by　bit,　and　the　color　of　the　channel　becomes　lighter.　©　2023　IEEE.