diff --git a/config/default-options.ts b/config/default-options.ts
index 097cf84..17bca62 100644
--- a/config/default-options.ts
+++ b/config/default-options.ts
@@ -1,6 +1,41 @@
 import { alphabetical } from 'radash/dist/array';
 import type { CalculationOptions } from 'stores/calculation/options/types';
 
+export const selectSeasonType = [
+  {
+    label: '6/6',
+    value: 100_000_000,
+  },
+  {
+    label: '8/4',
+    value: 100_000_001,
+  },
+  {
+    label: '4/4/4',
+    value: 100_000_002,
+  },
+  {
+    label: 'Гибкая дегрессия',
+    value: 100_000_007,
+  },
+  {
+    label: '100.50.25',
+    value: 100_000_003,
+  },
+  {
+    label: '100.30.10',
+    value: 100_000_004,
+  },
+  {
+    label: '100.70.40',
+    value: 100_000_005,
+  },
+  {
+    label: '100.7.3',
+    value: 100_000_006,
+  },
+];
+
 const defaultOptions: CalculationOptions = {
   radioLastPaymentRule: [
     {
@@ -51,40 +86,7 @@ const defaultOptions: CalculationOptions = {
     },
   ],
 
-  selectSeasonType: [
-    {
-      label: '6/6',
-      value: 100_000_000,
-    },
-    {
-      label: '8/4',
-      value: 100_000_001,
-    },
-    {
-      label: '4/4/4',
-      value: 100_000_002,
-    },
-    {
-      label: 'Гибкая дегрессия',
-      value: 100_000_007,
-    },
-    {
-      label: '100.50.25',
-      value: 100_000_003,
-    },
-    {
-      label: '100.30.10',
-      value: 100_000_004,
-    },
-    {
-      label: '100.70.40',
-      value: 100_000_005,
-    },
-    {
-      label: '100.7.3',
-      value: 100_000_006,
-    },
-  ],
+  selectSeasonType,
 
   selectHighSeasonStart: Array.from(
     {
diff --git a/config/default-values.ts b/config/default-values.ts
index 16308b6..2db3c13 100644
--- a/config/default-values.ts
+++ b/config/default-values.ts
@@ -23,7 +23,7 @@ const defaultValues: CalculationValues = {
   balanceHolder: 100_000_001,
   graphType: 100_000_000,
   parmentsDecreasePercent: 94,
-  seasonType: 100_000_000,
+  seasonType: null,
   highSeasonStart: 100_000_000,
   comissionPerc: 0,
   comissionRub: 0,
diff --git a/process/payments/reactions.ts b/process/payments/reactions.ts
index dcc4fb1..9dd1841 100644
--- a/process/payments/reactions.ts
+++ b/process/payments/reactions.ts
@@ -1,5 +1,8 @@
+/* eslint-disable function-paren-newline */
+/* eslint-disable implicit-arrow-linebreak */
 import type { ApolloClient } from '@apollo/client';
 import type { QueryClient } from '@tanstack/react-query';
+import { selectSeasonType } from 'config/default-options';
 import { reaction, toJS } from 'mobx';
 import { sort } from 'radash/dist/array';
 import type RootStore from 'stores/root';
@@ -207,4 +210,131 @@ export default function paymentsReactions(
       } else if (removeError) removeError();
     }
   );
+
+  /**
+   * Дегрессия
+   */
+  const mapGraphTypeToSeasonTypes: { [key: number]: Array<number> } = {
+    100_000_001: [100_000_003, 100_000_004, 100_000_005, 100_000_006, 100_000_007],
+    100_000_003: [100_000_000, 100_000_001, 100_000_002],
+  };
+
+  reaction(
+    () => {
+      const graphType = $calculation.getElementValue('radioGraphType');
+
+      return graphType;
+    },
+    (graphType) => {
+      if (!graphType) {
+        $calculation.setElementOptions('selectSeasonType', []);
+
+        return;
+      }
+
+      const allowedSeasonTypes = mapGraphTypeToSeasonTypes[graphType];
+      const selectSeasonTypeOptions = selectSeasonType.filter((option) =>
+        allowedSeasonTypes.includes(option.value)
+      );
+      $calculation.setElementOptions('selectSeasonType', selectSeasonTypeOptions);
+    }
+  );
+
+  const degressionSteps: { [key: number]: Array<number> } = {
+    100_000_003: [100, 50, 25],
+    100_000_004: [100, 30, 10],
+    100_000_005: [100, 70, 40],
+    100_000_006: [100, 7, 3],
+  };
+
+  reaction(
+    () => {
+      const degressionType = $calculation.getElementValue('selectSeasonType');
+      const leasingPeriod = $calculation.getElementValue('tbxLeasingPeriod');
+      const graphType = $calculation.getElementValue('radioGraphType');
+
+      return {
+        degressionType,
+        leasingPeriod,
+        graphType,
+      };
+    },
+    ({ degressionType, leasingPeriod, graphType }) => {
+      if (graphType === 100_000_001) {
+        let payments: Row[] = [];
+
+        switch (degressionType) {
+          case 100_000_007: {
+            const editablePayments: Row[] = Array.from(
+              {
+                length: leasingPeriod - 3,
+              },
+              () => ({
+                value: 100,
+                status: 'Default',
+              })
+            );
+
+            payments = [
+              {
+                value: 100,
+                status: 'Disabled',
+              },
+              ...editablePayments,
+            ];
+
+            break;
+          }
+          case 100_000_003:
+          case 100_000_004:
+          case 100_000_005:
+          case 100_000_006: {
+            const [step1, step2, step3] = degressionSteps[degressionType];
+            const paymentsInStep = Math.ceil((leasingPeriod - 2) / 3);
+
+            payments = Array.from(
+              {
+                length: leasingPeriod - 2,
+              },
+              (_v, i) => {
+                let value = step3;
+
+                if (i <= paymentsInStep * 2 - 1) {
+                  value = step2;
+                }
+
+                if (i <= paymentsInStep - 1) {
+                  value = step1;
+                }
+
+                return {
+                  value,
+                  status: 'Disabled',
+                };
+              }
+            );
+            break;
+          }
+          default: {
+            break;
+          }
+        }
+
+        const firstPaymentPerc = $calculation.getElementValue('tbxFirstPaymentPerc');
+        const lastPaymentPerc = $calculation.getElementValue('tbxLastPaymentPerc');
+
+        $tables.payments.setRows([
+          {
+            value: firstPaymentPerc,
+            status: 'Disabled',
+          },
+          ...payments,
+          {
+            value: lastPaymentPerc,
+            status: 'Disabled',
+          },
+        ]);
+      }
+    }
+  );
 }
diff --git a/stores/calculation/options/index.ts b/stores/calculation/options/index.ts
index 0043b38..3b2811c 100644
--- a/stores/calculation/options/index.ts
+++ b/stores/calculation/options/index.ts
@@ -34,7 +34,7 @@ export default class OptionsStore {
     if (
       // eslint-disable-next-line operator-linebreak
       !this.options[elementName]?.length ||
-      this.options[elementName].some((x) => x.value === value)
+      !this.options[elementName].some((x) => x.value === value)
     ) {
       this.root.$calculation.resetElementValue(elementName);
     }