diff --git a/src/main/java/com/xekr/ironstars/IronStarsUtil.java b/src/main/java/com/xekr/ironstars/IronStarsUtil.java
index eb8eb43..60df885 100644
--- a/src/main/java/com/xekr/ironstars/IronStarsUtil.java
+++ b/src/main/java/com/xekr/ironstars/IronStarsUtil.java
@@ -3,6 +3,10 @@
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 
+import java.util.Random;
+
 public class IronStarsUtil {
     public static final Gson GSON = new GsonBuilder().setPrettyPrinting().create();
+
+    public static final Random RANDOM = new Random();
 }
diff --git a/src/main/java/com/xekr/ironstars/blocks/entity/AbstractEfficiencyBlockEntity.java b/src/main/java/com/xekr/ironstars/blocks/entity/AbstractEFFBlockEntity.java
similarity index 68%
rename from src/main/java/com/xekr/ironstars/blocks/entity/AbstractEfficiencyBlockEntity.java
rename to src/main/java/com/xekr/ironstars/blocks/entity/AbstractEFFBlockEntity.java
index c336840..92f2d36 100644
--- a/src/main/java/com/xekr/ironstars/blocks/entity/AbstractEfficiencyBlockEntity.java
+++ b/src/main/java/com/xekr/ironstars/blocks/entity/AbstractEFFBlockEntity.java
@@ -5,7 +5,9 @@
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
 import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.entity.BlockEntityTicker;
 import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraftforge.common.capabilities.Capability;
@@ -13,13 +15,17 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-@Deprecated //TODO 先写着, 写完再去掉
-public abstract class AbstractEfficiencyBlockEntity extends BlockEntity {
+import java.util.Collections;
+import java.util.List;
+import java.util.UUID;
+
+public abstract class AbstractEFFBlockEntity extends BlockEntity {
     private int lazyTickCounter = 0;
 
-    @Nullable private BlockPos source;
+    @Nullable private UUID netId = null;
+    private List<BlockPos> sources = Collections.emptyList();
 
-    protected AbstractEfficiencyBlockEntity(BlockEntityType<?> type, BlockPos pos, BlockState state) {
+    protected AbstractEFFBlockEntity(BlockEntityType<?> type, BlockPos pos, BlockState state) {
         super(type, pos, state);
     }
 
@@ -43,7 +49,17 @@ public void load(CompoundTag pTag) {
     protected void saveAdditional(CompoundTag pTag) {
     }
 
-    public abstract int getGeneratedEfficiency();
+    public UUID getNetwork() {
+        return this.netId;
+    }
+
+    public boolean hasNetwork() {
+        return this.netId != null;
+    }
+
+    public abstract boolean isSourceMachine();
+
+    public abstract int getMachineEfficiency();
 
     public abstract boolean canOutput(@Nullable Direction side);
 
diff --git a/src/main/java/com/xekr/ironstars/efficiency/EFFNetwork.java b/src/main/java/com/xekr/ironstars/efficiency/EFFNetwork.java
new file mode 100644
index 0000000..b028a3a
--- /dev/null
+++ b/src/main/java/com/xekr/ironstars/efficiency/EFFNetwork.java
@@ -0,0 +1,35 @@
+package com.xekr.ironstars.efficiency;
+
+import com.xekr.ironstars.IronStarsUtil;
+import com.xekr.ironstars.blocks.entity.AbstractEFFBlockEntity;
+import net.minecraft.util.Mth;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public class EFFNetwork {
+    private static final Map<UUID, EFFNetwork> NETWORK = new HashMap<>();
+
+    private final UUID id;
+    private final Map<AbstractEFFBlockEntity, Integer> sources = new HashMap<>();
+    private final Map<AbstractEFFBlockEntity, Integer> members = new LinkedHashMap<>();
+
+    private EFFNetwork(AbstractEFFBlockEntity blockEntity) {
+        this.id = Mth.createInsecureUUID(IronStarsUtil.RANDOM);
+        this.sources.put(blockEntity, blockEntity.getMachineEfficiency());
+    }
+
+    public static EFFNetwork create(AbstractEFFBlockEntity blockEntity) {
+        if (blockEntity.hasNetwork() || !blockEntity.isSourceMachine()) return null;
+        EFFNetwork network = new EFFNetwork(blockEntity);
+        NETWORK.put(network.id, network);
+        return network;
+    }
+
+
+
+
+
+}
diff --git a/src/main/java/com/xekr/ironstars/efficiency/EfficiencyNetwork.java b/src/main/java/com/xekr/ironstars/efficiency/EfficiencyNetwork.java
deleted file mode 100644
index d24dc6c..0000000
--- a/src/main/java/com/xekr/ironstars/efficiency/EfficiencyNetwork.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.xekr.ironstars.efficiency;
-
-public class EfficiencyNetwork {
-}