diff --git a/demo/src/test/java/com/example/demo/circulator/service/CirService.java b/demo/src/test/java/com/example/demo/circulator/service/CirService.java
new file mode 100644
index 0000000..c3be9ef
--- /dev/null
+++ b/demo/src/test/java/com/example/demo/circulator/service/CirService.java
@@ -0,0 +1,16 @@
+package com.example.demo.circulator.service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.transaction.annotation.Transactional;
+
+import javax.annotation.PostConstruct;
+
+public abstract class CirService {
+    @PostConstruct
+    public void init(){}
+
+    @Transactional //数据库与事物的一致性
+    public double NextCirculator(long checkNum){return 0;}
+    public double SumCirculator(long productNum,double amount,int year){return 0;}
+
+}
diff --git a/demo/src/test/java/com/example/demo/circulator/service/EPAIR_CirService.java b/demo/src/test/java/com/example/demo/circulator/service/EPAIR_CirService.java
new file mode 100644
index 0000000..e93758b
--- /dev/null
+++ b/demo/src/test/java/com/example/demo/circulator/service/EPAIR_CirService.java
@@ -0,0 +1,40 @@
+package com.example.demo.circulator.service;
+
+import com.example.demo.Dao.productMapper;
+import com.example.demo.Dao.usageDateMapper;
+import com.example.demo.bean.Product;
+import com.example.demo.bean.UsageDate;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.transaction.annotation.Transactional;
+
+import javax.annotation.PostConstruct;
+
+public class EPAIR_CirService extends CirService{
+    @Autowired
+    private usageDateMapper usageDateMapper;
+    private productMapper productMapper;
+
+    @Transactional //数据库与事物的一致性
+    public double NextCirculator(long checkNum){
+        UsageDate usageDate = usageDateMapper.selectUsageDateByCheckNum(checkNum);
+        int year = usageDate.getYear();
+        double amount = usageDate.getAmount();
+        long productNum = usageDate.getProductNum();
+
+        Product product = productMapper.selectProductByProductNum(productNum);
+        float intrate = product.getIntrate();
+        intrate /= 12;
+        int month = year*12;
+        double rep = Math.pow((1+intrate),month)/(Math.pow((1+intrate),month)-1);
+        double next_principal_and_interest = rep * intrate * amount;
+        return next_principal_and_interest;
+    }
+
+    public double SumCirculator(long productNum,double amount,int year){
+        Product product = productMapper.selectProductByProductNum(productNum);
+        float intrate = product.getIntrate();
+        double rep = Math.pow((1+intrate),year)/(Math.pow((1+intrate),year)-1);
+        double principal_and_interest = rep * intrate * amount * year;
+        return principal_and_interest;
+    }
+}
diff --git a/demo/src/test/java/com/example/demo/circulator/service/EPR_CirService.java b/demo/src/test/java/com/example/demo/circulator/service/EPR_CirService.java
new file mode 100644
index 0000000..e47223e
--- /dev/null
+++ b/demo/src/test/java/com/example/demo/circulator/service/EPR_CirService.java
@@ -0,0 +1,43 @@
+package com.example.demo.circulator.service;
+
+import com.example.demo.Dao.productMapper;
+import com.example.demo.Dao.usageDateMapper;
+import com.example.demo.bean.Product;
+import com.example.demo.bean.UsageDate;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.transaction.annotation.Transactional;
+
+import javax.annotation.PostConstruct;
+
+public class EPR_CirService extends CirService{
+    @Autowired
+    private usageDateMapper usageDateMapper;
+    private productMapper productMapper;
+
+    @Transactional //数据库与事物的一致性
+    public double NextCirculator(long checkNum){
+        UsageDate usageDate = usageDateMapper.selectUsageDateByCheckNum(checkNum);
+        int year = usageDate.getYear();
+        double amount = usageDate.getAmount();
+        long productNum = usageDate.getProductNum();
+
+        Product product = productMapper.selectProductByProductNum(productNum);
+        float intrate = product.getIntrate();
+        double rep_amount = 0;
+        intrate /= 12;
+        int month = year*12;
+        double next_principal_and_interest = amount/month + (amount - rep_amount) * intrate;
+        return next_principal_and_interest;
+    }
+
+    public double SumCirculator(long productNum,double amount,int year){
+        Product product = productMapper.selectProductByProductNum(productNum);
+        float intrate = product.getIntrate();
+        intrate /= 12;
+        int month = year * 12;
+        double first_principal_and_interest = amount/month + amount*intrate;
+        double last_principal_and_interest = amount/month + amount*(1-(month-1)/month)*intrate;
+        double principal_and_interest = (first_principal_and_interest + last_principal_and_interest)*month/2;
+        return principal_and_interest;
+    }
+}
diff --git a/demo/src/test/java/com/example/demo/circulator/service/controller/NextCirController.java b/demo/src/test/java/com/example/demo/circulator/service/controller/NextCirController.java
index 91dd649..7b1e666 100644
--- a/demo/src/test/java/com/example/demo/circulator/service/controller/NextCirController.java
+++ b/demo/src/test/java/com/example/demo/circulator/service/controller/NextCirController.java
@@ -26,7 +26,7 @@ public class NextCirController {
                 cirService = new EPR_CirService();
                 break;
             default:
-                System.out.println("not exit");
+                System.out.println("not exit！！");
                 break;
         }
         double next_principal_and_intrate = cirService.NextCirculator(checkNum);
diff --git a/demo/src/test/java/com/example/demo/circulator/service/controller/SumCirController.java b/demo/src/test/java/com/example/demo/circulator/service/controller/SumCirController.java
index 64ac7d0..9b445ce 100644
--- a/demo/src/test/java/com/example/demo/circulator/service/controller/SumCirController.java
+++ b/demo/src/test/java/com/example/demo/circulator/service/controller/SumCirController.java
@@ -29,7 +29,7 @@ public class SumCirController {
                 cirService = new EPR_CirService();
                 break;
             default:
-                System.out.println("not exit ");
+                System.out.println("not exit！！");
                 break;
         }
         double sum_principal_and_intrate = cirService.SumCirculator(productNum,amount,year);