The　method　of　using　distribution　transformer　monitoring　data　for　condition　diagnosis　of　reactive　power　compensation　devices　is　proposed,　introducing　a　clustering　algorithm　based　on　u-shapelets　feature　extraction　of　time　series　data,　and　then　defining　the　health　degree　to　realize　the　diagnostic　assessment　of　the　operation　condition　of　distribution　transformer　reactive　power　compensation　using　distribution　transformer　monitoring　data　without　installing　additional　monitoring　equipment.　©　2023　IEEE.