diff --git a/.azure-pipelines/run-test-scheduler-template.yml b/.azure-pipelines/run-test-scheduler-template.yml
index afab6244f5..bf1195a01a 100644
--- a/.azure-pipelines/run-test-scheduler-template.yml
+++ b/.azure-pipelines/run-test-scheduler-template.yml
@@ -11,12 +11,12 @@ parameters:
   default: 36000
 
 - name: MIN_WORKER
-  type: number
+  type: string
   default: 1
 
 - name: MAX_WORKER
-  type: number
-  default: 2
+  type: string
+  default: 1
 
 - name: TEST_SET
   type: string
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 38e565535e..d7c1f2dea8 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -176,8 +176,8 @@ stages:
     - template: .azure-pipelines/run-test-scheduler-template.yml
       parameters:
         TOPOLOGY: t0
-        MIN_WORKER: 2
-        MAX_WORKER: 3
+        MIN_WORKER: $(T0_INSTANCE_NUM)
+        MAX_WORKER: $(T0_INSTANCE_NUM)
         MGMT_BRANCH: 202205
 
   - job: t0_2vlans_testbedv2
@@ -192,7 +192,8 @@ stages:
       parameters:
         TOPOLOGY: t0
         TEST_SET: t0-2vlans
-        MAX_WORKER: 1
+        MIN_WORKER: $(T0_2VLANS_INSTANCE_NUM)
+        MAX_WORKER: $(T0_2VLANS_INSTANCE_NUM)
         DEPLOY_MG_EXTRA_PARAMS: "-e vlan_config=two_vlan_a"
         MGMT_BRANCH: 202205
 
@@ -252,8 +253,8 @@ stages:
     - template: .azure-pipelines/run-test-scheduler-template.yml
       parameters:
         TOPOLOGY: t1-lag
-        MIN_WORKER: 2
-        MAX_WORKER: 3
+        MIN_WORKER: $(T1_LAG_INSTANCE_NUM)
+        MAX_WORKER: $(T1_LAG_INSTANCE_NUM)
         MGMT_BRANCH: 202205
 
   - job:
@@ -309,8 +310,8 @@ stages:
       - template: .azure-pipelines/run-test-scheduler-template.yml
         parameters:
           TOPOLOGY: t0-64-32
-          MIN_WORKER: 1
-          MAX_WORKER: 2
+          MIN_WORKER: $(T0_SONIC_INSTANCE_NUM)
+          MAX_WORKER: $(T0_SONIC_INSTANCE_NUM)
           TEST_SET: t0-sonic
           COMMON_EXTRA_PARAMS: "--neighbor_type=sonic --enable_macsec --macsec_profile=128_SCI,256_XPN_SCI"
           VM_TYPE: vsonic
@@ -328,7 +329,7 @@ stages:
       - template: .azure-pipelines/run-test-scheduler-template.yml
         parameters:
           TOPOLOGY: dualtor
-          MIN_WORKER: 1
-          MAX_WORKER: 1
+          MIN_WORKER: $(T0_DUALTOR_INSTANCE_NUM)
+          MAX_WORKER: $(T0_DUALTOR_INSTANCE_NUM)
           COMMON_EXTRA_PARAMS: "--disable_loganalyzer "
           MGMT_BRANCH: 202205