diff --git a/flight_quality/rules.py b/flight_quality/rules.py
new file mode 100644
index 0000000..b77bb23
--- /dev/null
+++ b/flight_quality/rules.py
@@ -0,0 +1,15 @@
+from .model import Issue, Sample
+
+
+def validate(samples: list[Sample]) -> list[Issue]:
+    issues = []
+    previous_time = None
+    for sample in samples:
+        if previous_time is not None and sample.time_ms <= previous_time:
+            issues.append(Issue(sample.line, "TIME_ORDER", "采样时间未严格递增"))
+        previous_time = sample.time_ms
+        if not -40 <= sample.temperature_c <= 85:
+            issues.append(Issue(sample.line, "TEMP_RANGE", "温度超出试验量程"))
+        if not 9 <= sample.voltage_v <= 16:
+            issues.append(Issue(sample.line, "VOLT_RANGE", "电压超出试验量程"))
+    return issues