diff --git a/runtime.py b/runtime.py
index 483a128..bd67658 100644
--- a/runtime.py
+++ b/runtime.py
@@ -71,6 +71,7 @@ class RuntimeProductLines:
         self.product_lines_list = list(self.product_lines)
 
 
+# 运行时工序
 class RuntimeProcess:
 
     def __init__(self, runtime_product: RuntimeProduct, process: model.Process):
@@ -80,6 +81,7 @@ class RuntimeProcess:
         self.delay = self.runtime_product.ddl - timedelta(minutes=process.pdt_time)
 
 
+# 运行时资源需求
 class RuntimeResourceNeed:
 
     def __int__(self,
@@ -97,6 +99,7 @@ class RuntimeResourceNeed:
         self.end: datetime = end
 
 
+# 运行时资源
 class RuntimeResource:
 
     def __init__(self, resource: model.Resource):
@@ -125,7 +128,37 @@ class RuntimeResource:
             self.schedules = sorted(self.schedules, key=lambda need: need.start)
             return True
 
+    def get_earliest_available_free_times(self, duration: timedelta) -> datetime:
 
+        # 没有已分配任务
+        if self.schedules == 0:
+            return datetime.now()
+
+        # 只有一个已分配任务
+        if self.schedules == 1:
+            target_schedule = self.schedules[0]
+            if datetime.now() < target_schedule.start:
+                if target_schedule.start - datetime.now() > duration:
+                    return target_schedule.start - duration
+
+            else:
+                return target_schedule.end
+        # 正常执行
+        for i in range(len(self.schedules) - 2):
+            pre_schedule = self.schedules[i]
+            back_schedule = self.schedules[i + 1]
+
+            if datetime.now() < pre_schedule.start:
+                if pre_schedule.start - datetime.now() > duration:
+                    return pre_schedule.start - duration
+
+            elif back_schedule.start - pre_schedule.end > duration:
+                return pre_schedule.end
+
+        return self.schedules[-1].end
+
+
+# 资源池
 class RuntimeResourcePool:
 
     def __init__(self, resources: List[model.Resource]):
@@ -138,13 +171,45 @@ class RuntimeResourcePool:
     def alloc_resource(self, resource_need: RuntimeResourceNeed) -> bool:
         # 精确搜索
         for runtime_resource in self.pool:
+            # 排除不同车间
+            if runtime_resource.workspace != resource_need.workspace:
+                continue
             if runtime_resource.basic_attr == resource_need.resource_attr:
                 if runtime_resource.add_schedule(resource_need) is True:
                     return True
         # 放宽条件搜索
         for runtime_resource in self.pool:
+            # 排除不同车间
+            if runtime_resource.workspace != resource_need.workspace:
+                continue
             if resource_need.resource_attr in runtime_resource.resource_attrs:
                 if runtime_resource.add_schedule(resource_need) is True:
                     return True
 
         return False
+
+    def get_earliest_free_time(self, resource_need: RuntimeResourceNeed) -> datetime:
+
+        earliest_time: Optional[datetime] = None
+
+        duration = resource_need.end - resource_need.start
+
+        # 精确搜索
+        for runtime_resource in self.pool:
+            if runtime_resource.basic_attr == resource_need.resource_attr:
+                temp_earliest_time = runtime_resource.get_earliest_available_free_times(duration)
+                if earliest_time is None or earliest_time > temp_earliest_time:
+                    earliest_time = temp_earliest_time
+
+        # 优先利用对口资源
+        if earliest_time is not None:
+            return earliest_time
+
+        # 放宽条件搜索
+        for runtime_resource in self.pool:
+            if resource_need.resource_attr in runtime_resource.resource_attrs:
+                temp_earliest_time = runtime_resource.get_earliest_available_free_times(duration)
+                if earliest_time is None or earliest_time > temp_earliest_time:
+                    earliest_time = temp_earliest_time
+
+        return earliest_time