diff --git a/server/src/main/java/com/rocketmq/studio/cluster/metrics/PrometheusMetricsSource.java b/server/src/main/java/com/rocketmq/studio/cluster/metrics/PrometheusMetricsSource.java
index 701bab1a..de208331 100644
--- a/server/src/main/java/com/rocketmq/studio/cluster/metrics/PrometheusMetricsSource.java
+++ b/server/src/main/java/com/rocketmq/studio/cluster/metrics/PrometheusMetricsSource.java
@@ -108,10 +108,22 @@ private void validateQuery(MetricQueryDTO query) {
         if (query == null) {
             throw new PrometheusException(HttpStatus.BAD_REQUEST.value(), "Metric query is required");
         }
+        if (!StringUtils.hasText(query.getMetric())) {
+            throw new PrometheusException(HttpStatus.BAD_REQUEST.value(), "Metric query is required");
+        }
+        if (query.getStart() <= 0) {
+            throw new PrometheusException(HttpStatus.BAD_REQUEST.value(), "Metric query start must be positive");
+        }
+        if (query.getEnd() <= 0) {
+            throw new PrometheusException(HttpStatus.BAD_REQUEST.value(), "Metric query end must be positive");
+        }
         if (query.getEnd() < query.getStart()) {
             throw new PrometheusException(HttpStatus.BAD_REQUEST.value(),
                     "Metric query end must not be earlier than start");
         }
+        if (!StringUtils.hasText(query.getStep())) {
+            throw new PrometheusException(HttpStatus.BAD_REQUEST.value(), "Metric query step is required");
+        }
     }
 
     private URI queryRangeUri() {
diff --git a/server/src/test/java/com/rocketmq/studio/cluster/metrics/PrometheusMetricsSourceTest.java b/server/src/test/java/com/rocketmq/studio/cluster/metrics/PrometheusMetricsSourceTest.java
index 3d2fbb26..905d6887 100644
--- a/server/src/test/java/com/rocketmq/studio/cluster/metrics/PrometheusMetricsSourceTest.java
+++ b/server/src/test/java/com/rocketmq/studio/cluster/metrics/PrometheusMetricsSourceTest.java
@@ -244,6 +244,70 @@ void queryShouldRejectEndEarlierThanStart() {
                 .hasMessage("Metric query end must not be earlier than start");
     }
 
+    @Test
+    void queryShouldRejectBlankMetric() {
+        MetricQueryDTO invalidQuery = MetricQueryDTO.builder()
+                .metric(" ")
+                .start(1L)
+                .end(2L)
+                .step("30s")
+                .build();
+
+        assertThatThrownBy(() -> source(Duration.ofSeconds(2)).query(invalidQuery))
+                .isInstanceOf(PrometheusException.class)
+                .satisfies(exception -> assertThat(((PrometheusException) exception).getStatusCode())
+                        .isEqualTo(HttpStatus.BAD_REQUEST.value()))
+                .hasMessage("Metric query is required");
+    }
+
+    @Test
+    void queryShouldRejectNonPositiveStart() {
+        MetricQueryDTO invalidQuery = MetricQueryDTO.builder()
+                .metric("up")
+                .start(0L)
+                .end(2L)
+                .step("30s")
+                .build();
+
+        assertThatThrownBy(() -> source(Duration.ofSeconds(2)).query(invalidQuery))
+                .isInstanceOf(PrometheusException.class)
+                .satisfies(exception -> assertThat(((PrometheusException) exception).getStatusCode())
+                        .isEqualTo(HttpStatus.BAD_REQUEST.value()))
+                .hasMessage("Metric query start must be positive");
+    }
+
+    @Test
+    void queryShouldRejectNonPositiveEnd() {
+        MetricQueryDTO invalidQuery = MetricQueryDTO.builder()
+                .metric("up")
+                .start(1L)
+                .end(0L)
+                .step("30s")
+                .build();
+
+        assertThatThrownBy(() -> source(Duration.ofSeconds(2)).query(invalidQuery))
+                .isInstanceOf(PrometheusException.class)
+                .satisfies(exception -> assertThat(((PrometheusException) exception).getStatusCode())
+                        .isEqualTo(HttpStatus.BAD_REQUEST.value()))
+                .hasMessage("Metric query end must be positive");
+    }
+
+    @Test
+    void queryShouldRejectBlankStep() {
+        MetricQueryDTO invalidQuery = MetricQueryDTO.builder()
+                .metric("up")
+                .start(1L)
+                .end(2L)
+                .step(" ")
+                .build();
+
+        assertThatThrownBy(() -> source(Duration.ofSeconds(2)).query(invalidQuery))
+                .isInstanceOf(PrometheusException.class)
+                .satisfies(exception -> assertThat(((PrometheusException) exception).getStatusCode())
+                        .isEqualTo(HttpStatus.BAD_REQUEST.value()))
+                .hasMessage("Metric query step is required");
+    }
+
     @Test
     void queryShouldFailLoudWhenPrometheusIsNotConfigured() {
         PrometheusProperties properties = new PrometheusProperties();