diff --git a/docs/api/sql/Parameter.md b/docs/api/sql/Parameter.md
index 437f4e8788..ccf2c52fa2 100644
--- a/docs/api/sql/Parameter.md
+++ b/docs/api/sql/Parameter.md
@@ -26,7 +26,7 @@ sparkSession.conf.set("sedona.global.index","false")
 	* Possible values: true, false
 * sedona.global.indextype
 	* Spatial index type, only valid when "sedona.global.index" is true
-	* Default: quadtree
+	* Default: rtree
 	* Possible values: rtree, quadtree
 * sedona.join.autoBroadcastJoinThreshold
 	* Configures the maximum size in bytes for a table that will be broadcast to all worker nodes when performing a join.
diff --git a/spark/common/src/main/java/org/apache/sedona/core/utils/SedonaConf.java b/spark/common/src/main/java/org/apache/sedona/core/utils/SedonaConf.java
index 39c7093073..4364b44425 100644
--- a/spark/common/src/main/java/org/apache/sedona/core/utils/SedonaConf.java
+++ b/spark/common/src/main/java/org/apache/sedona/core/utils/SedonaConf.java
@@ -67,7 +67,7 @@ public static SedonaConf fromActiveSession() {
     public SedonaConf(RuntimeConfig runtimeConfig)
     {
         this.useIndex = Boolean.parseBoolean(runtimeConfig.get("sedona.global.index", "true"));
-        this.indexType = IndexType.getIndexType(runtimeConfig.get("sedona.global.indextype", "quadtree"));
+        this.indexType = IndexType.getIndexType(runtimeConfig.get("sedona.global.indextype", "rtree"));
         this.joinApproximateTotalCount = Long.parseLong(runtimeConfig.get("sedona.join.approxcount", "-1"));
         String[] boundaryString = runtimeConfig.get("sedona.join.boundary", "0,0,0,0").split(",");
         this.datasetBoundary = new Envelope(Double.parseDouble(boundaryString[0]), Double.parseDouble(boundaryString[1]),