diff --git a/panel-start.sh b/panel-start.sh
index 6782955..d4026bc 100755
--- a/panel-start.sh
+++ b/panel-start.sh
@@ -11,9 +11,31 @@ PT_SERVER="${PT_SERVER:-server-02-skygrid}"
 INSTALL_DIR="${INSTALL_DIR:-$(pwd)/pt-minecraft-modpack}"
 ARCHIVE_PATH="${ARCHIVE_PATH:-$(pwd)/pt-minecraft-modpack.tar.gz}"
 TMP_DIR="${TMP_DIR:-$(pwd)/pt-minecraft-modpack.__tmp}"
-PT_JAVA_ARGS="${PT_JAVA_ARGS:--Xms1G -Xmx1G}"
+PT_JAVA_VERSION="${PT_JAVA_VERSION:-17}"
+SERVER_MEMORY="${SERVER_MEMORY:-2048}"
 PACKWIZ_INSTALLER_URL="${PACKWIZ_INSTALLER_URL:-https://github.com/packwiz/packwiz-installer/releases/latest/download/packwiz-installer.jar}"
 
+openjdk8="/usr/bin/jdk/jdk1.8.0_361/bin/java"
+openjdk11="/usr/bin/jdk/jdk-11.0.18/bin/java"
+openjdk17="/usr/bin/jdk/jdk-17.0.6/bin/java"
+openjdk19="/usr/bin/jdk/jdk-19.0.2/bin/java"
+openjdk21="/usr/bin/jdk/jdk-21.0.2/bin/java"
+openjdk25="/usr/bin/jdk/jdk-25.0.2/bin/java"
+
+maxmem=$((SERVER_MEMORY - 1000))
+
+case "$PT_JAVA_VERSION" in
+  8)  JAVA_BIN="$openjdk8" ;;
+  11) JAVA_BIN="$openjdk11" ;;
+  17) JAVA_BIN="$openjdk17" ;;
+  19) JAVA_BIN="$openjdk19" ;;
+  21) JAVA_BIN="$openjdk21" ;;
+  25) JAVA_BIN="$openjdk25" ;;
+  *)  JAVA_BIN="java" ;;
+esac
+
+PT_JAVA_ARGS="${PT_JAVA_ARGS:--Xms1024M -Xmx${maxmem}M}"
+
 ############
 # 辅助函数 #
 ############
@@ -79,6 +101,9 @@ PT_REPO_URL="$REPO_URL" \
 PT_REPO_REF="$REPO_REF" \
 PT_SERVER="$PT_SERVER" \
 PT_JAVA_ARGS="$PT_JAVA_ARGS" \
+PT_JAVA_VERSION="$PT_JAVA_VERSION" \
+SERVER_MEMORY="$SERVER_MEMORY" \
+JAVA_BIN="$JAVA_BIN" \
 PT_PACKWIZ_BOOTSTRAP_NO_UPDATE="${PT_PACKWIZ_BOOTSTRAP_NO_UPDATE:-1}" \
 PT_PACKWIZ_BOOTSTRAP_MAIN_JAR="$(pwd)/.pt-panel-runtime/downloads/packwiz-installer.jar" \
 bash ./start.sh