diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/stream/TerminableWrappedStream.java b/hutool-core/src/main/java/org/dromara/hutool/core/stream/TerminableWrappedStream.java
index 1e9aa797a..8b8a953a1 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/stream/TerminableWrappedStream.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/stream/TerminableWrappedStream.java
@@ -269,16 +269,12 @@ public interface TerminableWrappedStream<T, S extends TerminableWrappedStream<T,
 	@SuppressWarnings("ResultOfMethodCallIgnored")
 	default int findFirstIdx(final Predicate<? super T> predicate) {
 		Objects.requireNonNull(predicate);
-		if (isParallel()) {
-			return NOT_FOUND_ELEMENT_INDEX;
-		} else {
-			final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
-			unwrap().filter(e -> {
-				index.increment();
-				return predicate.test(e);
-			}).findFirst();// 此处只做计数，不需要值
-			return index.get();
-		}
+		final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
+		unwrap().filter(e -> {
+			index.increment();
+			return predicate.test(e);
+		}).findFirst();// 此处只做计数，不需要值
+		return index.get();
 	}
 
 	/**
@@ -317,17 +313,13 @@ public interface TerminableWrappedStream<T, S extends TerminableWrappedStream<T,
 	 */
 	default int findLastIdx(final Predicate<? super T> predicate) {
 		Objects.requireNonNull(predicate);
-		if (isParallel()) {
-			return NOT_FOUND_ELEMENT_INDEX;
-		} else {
-			final MutableInt idxRef = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
-			forEachIdx((e, i) -> {
-				if (predicate.test(e)) {
-					idxRef.set(i);
-				}
-			});
-			return idxRef.get();
-		}
+		final MutableInt idxRef = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
+		forEachIdx((e, i) -> {
+			if (predicate.test(e)) {
+				idxRef.set(i);
+			}
+		});
+		return idxRef.get();
 	}
 
 	/**
@@ -505,14 +497,8 @@ public interface TerminableWrappedStream<T, S extends TerminableWrappedStream<T,
 	 */
 	default void forEachIdx(final BiConsumer<? super T, Integer> action) {
 		Objects.requireNonNull(action);
-		final boolean isParallel = isParallel();
-		if (isParallel) {
-			EasyStream.of(toIdxMap().entrySet()).parallel()
-				.forEach(e -> action.accept(e.getValue(), e.getKey()));
-		} else {
-			final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
-			unwrap().forEach(e -> action.accept(e, index.incrementAndGet()));
-		}
+		final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
+		unwrap().forEach(e -> action.accept(e, index.incrementAndGet()));
 	}
 
 	/**
@@ -523,14 +509,8 @@ public interface TerminableWrappedStream<T, S extends TerminableWrappedStream<T,
 	 */
 	default void forEachOrderedIdx(final BiConsumer<? super T, Integer> action) {
 		Objects.requireNonNull(action);
-		final boolean isParallel = isParallel();
-		if (isParallel) {
-			EasyStream.of(toIdxMap().entrySet()).parallel()
-				.forEachOrdered(e -> action.accept(e.getValue(), e.getKey()));
-		} else {
-			final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
-			unwrap().forEachOrdered(e -> action.accept(e, index.incrementAndGet()));
-		}
+		final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
+		unwrap().forEachOrdered(e -> action.accept(e, index.incrementAndGet()));
 	}
 
 	// endregion
diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/stream/TransformableWrappedStream.java b/hutool-core/src/main/java/org/dromara/hutool/core/stream/TransformableWrappedStream.java
index 308611eb1..5eed41ae1 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/stream/TransformableWrappedStream.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/stream/TransformableWrappedStream.java
@@ -279,17 +279,8 @@ public interface TransformableWrappedStream<T, S extends TransformableWrappedStr
 	 */
 	default S peekIdx(final BiConsumer<? super T, Integer> action) {
 		Objects.requireNonNull(action);
-		final boolean isParallel = isParallel();
-		if (isParallel) {
-			final Map<Integer, T> idxMap = easyStream().toIdxMap();
-			return wrap(EasyStream.of(idxMap.entrySet())
-				.parallel()
-				.peek(e -> action.accept(e.getValue(), e.getKey()))
-				.map(Map.Entry::getValue));
-		} else {
-			final AtomicInteger index = new AtomicInteger(NOT_FOUND_ELEMENT_INDEX);
-			return peek(e -> action.accept(e, index.incrementAndGet()));
-		}
+		final AtomicInteger index = new AtomicInteger(NOT_FOUND_ELEMENT_INDEX);
+		return peek(e -> action.accept(e, index.incrementAndGet()));
 	}
 
 	/**
@@ -384,16 +375,8 @@ public interface TransformableWrappedStream<T, S extends TransformableWrappedStr
 	 */
 	default S filterIdx(final BiPredicate<? super T, Integer> predicate) {
 		Objects.requireNonNull(predicate);
-		final boolean isParallel = isParallel();
-		if (isParallel) {
-			final Map<Integer, T> idxMap = easyStream().toIdxMap();
-			return wrap(EasyStream.of(idxMap.entrySet()).parallel()
-				.filter(e -> predicate.test(e.getValue(), e.getKey()))
-				.map(Map.Entry::getValue));
-		} else {
-			final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
-			return filter(e -> predicate.test(e, index.incrementAndGet()));
-		}
+		final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
+		return filter(e -> predicate.test(e, index.incrementAndGet()));
 	}
 
 	/**
@@ -441,15 +424,8 @@ public interface TransformableWrappedStream<T, S extends TransformableWrappedStr
 	 */
 	default <R> EasyStream<R> flatMapIdx(final BiFunction<? super T, Integer, ? extends Stream<? extends R>> mapper) {
 		Objects.requireNonNull(mapper);
-		final boolean isParallel = isParallel();
-		if (isParallel) {
-			final Map<Integer, T> idxMap = easyStream().toIdxMap();
-			return EasyStream.of(idxMap.entrySet()).parallel()
-				.flatMap(e -> mapper.apply(e.getValue(), e.getKey()));
-		} else {
-			final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
-			return flatMap(e -> mapper.apply(e, index.incrementAndGet()));
-		}
+		final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
+		return flatMap(e -> mapper.apply(e, index.incrementAndGet()));
 	}
 
 	/**
@@ -554,15 +530,8 @@ public interface TransformableWrappedStream<T, S extends TransformableWrappedStr
 	 */
 	default <R> EasyStream<R> mapIdx(final BiFunction<? super T, Integer, ? extends R> mapper) {
 		Objects.requireNonNull(mapper);
-		final boolean isParallel = isParallel();
-		if (isParallel) {
-			final Map<Integer, T> idxMap = easyStream().toIdxMap();
-			return EasyStream.of(idxMap.entrySet()).parallel()
-				.map(e -> mapper.apply(e.getValue(), e.getKey()));
-		} else {
-			final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
-			return map(e -> mapper.apply(e, index.incrementAndGet()));
-		}
+		final MutableInt index = new MutableInt(NOT_FOUND_ELEMENT_INDEX);
+		return map(e -> mapper.apply(e, index.incrementAndGet()));
 	}
 
 	/**
diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/stream/EasyStreamTest.java b/hutool-core/src/test/java/org/dromara/hutool/core/stream/EasyStreamTest.java
index 2e9194ca5..357b24e4f 100644
--- a/hutool-core/src/test/java/org/dromara/hutool/core/stream/EasyStreamTest.java
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/stream/EasyStreamTest.java
@@ -12,7 +12,6 @@ import org.junit.jupiter.api.Test;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.util.*;
-import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -145,9 +144,6 @@ public class EasyStreamTest {
 		final List<String> list = Arrays.asList("dromara", "hutool", "sweet");
 		final List<String> mapIndex = EasyStream.of(list).mapIdx((e, i) -> i + 1 + "." + e).toList();
 		Assertions.assertEquals(Arrays.asList("1.dromara", "2.hutool", "3.sweet"), mapIndex);
-		// 并行流时正常
-		Assertions.assertEquals(Arrays.asList("1.dromara", "2.hutool", "3.sweet"),
-				EasyStream.of("dromara", "hutool", "sweet").parallel().mapIdx((e, i) -> i + 1 + "." + e).toList());
 	}
 
 	@Test
@@ -199,10 +195,6 @@ public class EasyStreamTest {
 		final EasyStream.Builder<String> builder = EasyStream.builder();
 		EasyStream.of(list).forEachIdx((e, i) -> builder.accept(i + 1 + "." + e));
 		Assertions.assertEquals(Arrays.asList("1.dromara", "2.hutool", "3.sweet"), builder.build().toList());
-		// 并行流时正常
-		final AtomicInteger total = new AtomicInteger(0);
-		EasyStream.of("dromara", "hutool", "sweet").parallel().forEachIdx((e, i) -> total.addAndGet(i));
-		Assertions.assertEquals(3, total.get());
 	}
 
 	@Test
@@ -223,10 +215,6 @@ public class EasyStreamTest {
 		final List<String> list = Arrays.asList("dromara", "hutool", "sweet");
 		final List<String> mapIndex = EasyStream.of(list).flatMapIdx((e, i) -> EasyStream.of(i + 1 + "." + e)).toList();
 		Assertions.assertEquals(Arrays.asList("1.dromara", "2.hutool", "3.sweet"), mapIndex);
-		// 并行流时正常
-		Assertions.assertEquals(Arrays.asList("1.dromara", "2.hutool", "3.sweet"),
-				EasyStream.of("dromara", "hutool", "sweet").parallel()
-						.flatMapIdx((e, i) -> EasyStream.of(i + 1 + "." + e)).toList());
 	}
 
 	@Test
@@ -280,9 +268,6 @@ public class EasyStreamTest {
 		final List<String> list = Arrays.asList("dromara", "hutool", "sweet");
 		final List<String> filterIndex = EasyStream.of(list).filterIdx((e, i) -> i < 2).toList();
 		Assertions.assertEquals(Arrays.asList("dromara", "hutool"), filterIndex);
-		// 并行流时正常
-		Assertions.assertEquals(Arrays.asList("dromara", "hutool"),
-				EasyStream.of("dromara", "hutool", "sweet").parallel().filterIdx((e, i) -> i < 2).toList());
 	}
 
 	@Test
@@ -350,7 +335,6 @@ public class EasyStreamTest {
 	public void testFindFirstIdx() {
 		final List<Integer> list = Arrays.asList(null, 2, 3);
 		Assertions.assertEquals(1, EasyStream.of(list).findFirstIdx(Objects::nonNull));
-		Assertions.assertEquals(-1, (Object) EasyStream.of(list).parallel().findFirstIdx(Objects::nonNull));
 	}
 
 	@Test
@@ -370,7 +354,6 @@ public class EasyStreamTest {
 	public void testFindLastIdx() {
 		final List<Integer> list = Arrays.asList(1, null, 3);
 		Assertions.assertEquals(2, (Object) EasyStream.of(list).findLastIdx(Objects::nonNull));
-		Assertions.assertEquals(-1, (Object) EasyStream.of(list).parallel().findLastIdx(Objects::nonNull));
 	}
 
 	@Test