diff --git a/modules/item/back/methods/fixed-price/specs/upsertFixedPrice.spec.js b/modules/item/back/methods/fixed-price/specs/upsertFixedPrice.spec.js
index 68eacfbad..59defa738 100644
--- a/modules/item/back/methods/fixed-price/specs/upsertFixedPrice.spec.js
+++ b/modules/item/back/methods/fixed-price/specs/upsertFixedPrice.spec.js
@@ -72,4 +72,45 @@ describe('upsertFixedPrice()', () => {
             throw e;
         }
     });
+
+    it(`should recalculate rate2 if change rate3`, async() => {
+        const tx = await models.FixedPrice.beginTransaction({});
+
+        const tomorrow = new Date(now);
+        tomorrow.setDate(tomorrow.getDate() + 1);
+
+        const rate2 = 2;
+        const firstRate3 = 1;
+        const secondRate3 = 2;
+        try {
+            const options = {transaction: tx};
+            const ctx = {args: {
+                id: undefined,
+                itemFk: 1,
+                warehouseFk: 1,
+                started: tomorrow,
+                ended: tomorrow,
+                rate2: rate2,
+                rate3: firstRate3,
+                minPrice: 0,
+                hasMinPrice: false
+            }};
+
+            // create new fixed price
+            const newFixedPrice = await models.FixedPrice.upsertFixedPrice(ctx, options);
+
+            // change rate3 to same fixed price id
+            ctx.args.id = newFixedPrice.id;
+            ctx.args.rate3 = secondRate3;
+
+            const result = await models.FixedPrice.upsertFixedPrice(ctx, options);
+
+            expect(result.rate2).not.toEqual(rate2);
+
+            await tx.rollback();
+        } catch (e) {
+            await tx.rollback();
+            throw e;
+        }
+    });
 });
diff --git a/modules/item/back/methods/fixed-price/upsertFixedPrice.js b/modules/item/back/methods/fixed-price/upsertFixedPrice.js
index ad35ec3a1..c56c434ad 100644
--- a/modules/item/back/methods/fixed-price/upsertFixedPrice.js
+++ b/modules/item/back/methods/fixed-price/upsertFixedPrice.js
@@ -72,6 +72,16 @@ module.exports = Self => {
 
         try {
             delete args.ctx; // removed unwanted data
+
+            if (args.id) {
+                const beforeFixedPrice = await models.FixedPrice.findById(args.id, {fields: ['rate3']}, myOptions);
+                const [result] = await Self.rawSql(`SELECT vn.priceFixed_getRate2(?, ?) as rate2`,
+                    [args.id, args.rate3], myOptions);
+
+                if (beforeFixedPrice.rate3 != args.rate3 && result.rate2)
+                    args.rate2 = result.rate2;
+            }
+
             const fixedPrice = await models.FixedPrice.upsert(args, myOptions);
             const targetItem = await models.Item.findById(args.itemFk, null, myOptions);
 
diff --git a/modules/item/front/fixed-price/index.html b/modules/item/front/fixed-price/index.html
index f9d177562..ce7cefe7a 100644
--- a/modules/item/front/fixed-price/index.html
+++ b/modules/item/front/fixed-price/index.html
@@ -131,7 +131,7 @@
                                             class="dense"
                                             vn-focus
                                             ng-model="price.rate3"
-                                            on-change="$ctrl.upsertPrice(price); $ctrl.recalculateRate2(price)"
+                                            on-change="$ctrl.upsertPrice(price);"
                                             step="0.01"s>
                                         </vn-input-number>
                                     </field>
diff --git a/modules/item/front/fixed-price/index.js b/modules/item/front/fixed-price/index.js
index f03d73f08..df2989043 100644
--- a/modules/item/front/fixed-price/index.js
+++ b/modules/item/front/fixed-price/index.js
@@ -113,24 +113,6 @@ export default class Controller extends Section {
             return {[param]: value};
         }
     }
-
-    recalculateRate2(price) {
-        if (!price.id || !price.rate3) return;
-
-        const query = 'FixedPrices/getRate2';
-        const params = {
-            fixedPriceId: price.id,
-            rate3: price.rate3
-        };
-        this.$http.get(query, {params})
-            .then(res => {
-                const rate2 = res.data.rate2;
-                if (rate2) {
-                    price.rate2 = rate2;
-                    this.upsertPrice(price);
-                }
-            });
-    }
 }
 
 ngModule.vnComponent('vnFixedPrice', {
diff --git a/modules/item/front/fixed-price/index.spec.js b/modules/item/front/fixed-price/index.spec.js
index db9579444..94621e352 100644
--- a/modules/item/front/fixed-price/index.spec.js
+++ b/modules/item/front/fixed-price/index.spec.js
@@ -85,25 +85,5 @@ describe('fixed price', () => {
                 expect(controller.$.model.remove).toHaveBeenCalled();
             });
         });
-
-        describe('recalculateRate2()', () => {
-            it(`should rate2 recalculate`, () => {
-                jest.spyOn(controller.vnApp, 'showSuccess');
-                const price = {
-                    id: 1,
-                    itemFk: 1,
-                    rate2: 2,
-                    rate3: 2
-                };
-                const response = {rate2: 1};
-                controller.recalculateRate2(price);
-
-                const query = `FixedPrices/getRate2?fixedPriceId=${price.id}&rate3=${price.rate3}`;
-                $httpBackend.expectGET(query).respond(response);
-                $httpBackend.flush();
-
-                expect(price.rate2).toEqual(response.rate2);
-            });
-        });
     });
 });