diff --git a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/Helpers.scala b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/Helpers.scala
index fd0dff6b..616385ac 100644
--- a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/Helpers.scala
+++ b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/Helpers.scala
@@ -16,6 +16,8 @@
 
 package com.xiaomi.duckling.dimension.time
 
+import java.time.temporal.ChronoUnit
+
 import com.xiaomi.duckling.Types._
 import com.xiaomi.duckling.dimension.implicits._
 import com.xiaomi.duckling.dimension.time.enums.Grain
@@ -23,6 +25,7 @@ import com.xiaomi.duckling.dimension.time.enums.Grain._
 import com.xiaomi.duckling.dimension.time.form.{TimeOfDay, Month => _}
 import com.xiaomi.duckling.dimension.time.helper.TimeDataHelpers.hour
 import com.xiaomi.duckling.dimension.time.predicates.{TimeDatePredicate, TimePredicate}
+import com.xiaomi.duckling.dimension.time.Types.InstantValue
 
 object Helpers {
 
@@ -66,4 +69,20 @@ object Helpers {
       } else td2
   }
 
+  def countGrains(start: InstantValue, end: InstantValue): Int = {
+    val a = start.datetime.toLocalDatetime
+    val b = end.datetime.toLocalDatetime
+    val n = start.grain match {
+      case NoGrain | Second => ChronoUnit.SECONDS.between(a, b)
+      case Minute => ChronoUnit.MINUTES.between(a, b)
+      case Hour => ChronoUnit.HOURS.between(a, b)
+      case Day => ChronoUnit.DAYS.between(a, b)
+      case Week => ChronoUnit.WEEKS.between(a, b)
+      case Month => ChronoUnit.MONTHS.between(a, b)
+      case Quarter => ChronoUnit.MONTHS.between(a, b) / 3
+      case Year => ChronoUnit.YEARS.between(a, b)
+    }
+    n.intValue()
+  }
+
 }
diff --git a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/predicates.scala b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/predicates.scala
index 055d0a9e..4332ba5d 100644
--- a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/predicates.scala
+++ b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/predicates.scala
@@ -187,6 +187,11 @@ object predicates {
     case _ => false
   }
 
+  val isInterval: Predicate = {
+    case Token(Time, td: TimeData) => td.timePred.isInstanceOf[TimeIntervalsPredicate]
+    case _ => false
+  }
+
   val isIntervalOfDay: Predicate = {
     case Token(Time, td: TimeData) =>
       td.form match {
diff --git a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Repeat.scala b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Repeat.scala
index 022a9950..ea32ab1a 100644
--- a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Repeat.scala
+++ b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Repeat.scala
@@ -25,6 +25,7 @@ import com.xiaomi.duckling.dimension.time.grain.TimeGrain
 import com.xiaomi.duckling.dimension.time.Types._
 import com.xiaomi.duckling.dimension.time.enums.Grain
 import com.xiaomi.duckling.dimension.time.form.Form
+import com.xiaomi.duckling.dimension.time.Helpers.countGrains
 
 case object Repeat extends Dimension with Rules {
   override val name: String = "Repeat"
@@ -35,7 +36,9 @@ case object Repeat extends Dimension with Rules {
 case class RepeatData(interval: Option[DurationData] = None,
                       n: Option[Int] = None,
                       start: Option[TimeData] = None,
-                      workdayType: Option[WorkdayType] = None)
+                      workdayType: Option[WorkdayType] = None,
+                      repeatGrain: Option[Grain] = None,
+                      repeatNFromInterval: Option[TimeData] = None)
     extends Resolvable {
 
   override def resolve(context: Context,
@@ -48,7 +51,19 @@ case class RepeatData(interval: Option[DurationData] = None,
         }
       case None => (None, true)
     }
-    if (success) Some(RepeatValue(interval, n, instant, workdayType), false)
+    val repeatN = repeatNFromInterval match {
+      case Some(intervalTimeData) =>
+        intervalTimeData.resolve(context, options) match {
+          case Some((tv: TimeValue, _)) =>
+            tv.timeValue match {
+              case IntervalValue(start, end) => Some(countGrains(start, end))
+              case _ => None
+            }
+          case _ => None
+        }
+      case _ => None
+    }
+    if (success) Some(RepeatValue(interval, n.orElse(repeatN), instant, repeatGrain = repeatNFromInterval.map(_.timeGrain), workdayType), false)
     else None
   }
 }
@@ -63,6 +78,7 @@ case class RepeatData(interval: Option[DurationData] = None,
 case class RepeatValue(interval: Option[DurationData] = None,
                        n: Option[Int] = None,
                        start:  Option[(TimeValue, Option[Form])] = None,
+                       repeatGrain: Option[Grain] = None,
                        workdayType: Option[WorkdayType] = None)
     extends ResolvedValue {
 
diff --git a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Rules.scala b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Rules.scala
index ff4aaea1..d6311ad7 100644
--- a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Rules.scala
+++ b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Rules.scala
@@ -22,11 +22,12 @@ import com.xiaomi.duckling.Types._
 import com.xiaomi.duckling.dimension.DimRules
 import com.xiaomi.duckling.dimension.implicits._
 import com.xiaomi.duckling.dimension.matcher.GroupMatch
-import com.xiaomi.duckling.dimension.matcher.Prods.{regexMatch, singleRegexMatch}
-import com.xiaomi.duckling.dimension.time.{form, Time, TimeData}
+import com.xiaomi.duckling.dimension.matcher.Prods.regexMatch
+import com.xiaomi.duckling.dimension.time.{form, GrainWrapper, Time, TimeData}
 import com.xiaomi.duckling.dimension.time.duration.{Duration, DurationData}
 import com.xiaomi.duckling.dimension.time.enums.{Grain, Hint}
-import com.xiaomi.duckling.dimension.time.predicates.{isAPartOfDay, isATimeOfDay, isHint, isNotLatent, isTimeDatePredicate, IntersectTimePredicate, TimeDatePredicate, TimeIntervalsPredicate}
+import com.xiaomi.duckling.dimension.time.helper.TimeDataHelpers.intersect
+import com.xiaomi.duckling.dimension.time.predicates._
 
 trait Rules extends DimRules with LazyLogging {
   /**
@@ -155,4 +156,16 @@ trait Rules extends DimRules with LazyLogging {
       workdaysTime(rd, td)
     }
   )
+
+  // 周一到周五的早上八点
+  val ruleIntervalTime = Rule(
+    name = "<interval> <time/interval>",
+    pattern = List(isInterval.predicate, isDimension(Time).predicate),
+    prod = tokens { case Token(Time, outer: TimeData) :: Token(Time, inner: TimeData):: _ if outer.timeGrain > inner.timeGrain =>
+      val oInterval = outer.timePred.asInstanceOf[TimeIntervalsPredicate]
+      // start
+      val start = intersect(TimeData(oInterval.p1, timeGrain=outer.timeGrain), inner)
+      Token(Repeat, RepeatData(start = start, repeatNFromInterval = outer))
+    }
+  )
 }
diff --git a/duckling-fork-chinese/learning/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Examples.scala b/duckling-fork-chinese/learning/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Examples.scala
index 22a0dda8..95375c90 100644
--- a/duckling-fork-chinese/learning/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Examples.scala
+++ b/duckling-fork-chinese/learning/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Examples.scala
@@ -34,6 +34,10 @@ object Examples extends DimExamples {
   implicit def _toTuple(tv: TimeValue) = Option(tv, None: Option[Form])
 
   override def pairs: List[(ResolvedValue, List[String])] = List(
+    (RepeatValue(start = (datetimeInterval(
+      new DuckDateTime(LocalDateTime.of(2013, 2, 18, 12, 0, 0)),
+      new DuckDateTime(LocalDateTime.of(2013, 2, 18, 18, 0, 0)),
+      Hour), None), repeatGrain = Day, n = 3), List("周一到周三下午")),
     (RepeatValue(DurationData(1, Day, schema = "P1D")), List("每天")),
     (RepeatValue(DurationData(1, Week, schema = "P1W")), List("每周")),
     (RepeatValue(DurationData(15, Minute, schema = "PT15M")), List("每隔15分钟", "隔15分钟")),
diff --git a/duckling-fork-chinese/project/build.properties b/duckling-fork-chinese/project/build.properties
index 8b9a0b0a..ee4c672c 100644
--- a/duckling-fork-chinese/project/build.properties
+++ b/duckling-fork-chinese/project/build.properties
@@ -1 +1 @@
-sbt.version=1.8.0
+sbt.version=1.10.1