diff --git a/README.md b/README.md
index c369b29c..240a62bc 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@ The following parameters can be set in config files or in env variables:
 - RESOURCES_API_URL: TC resources API base URL
 - GROUPS_API_URL: TC groups API base URL
 - PROJECTS_API_URL: TC projects API base URL
+- CHALLENGE_MIGRATION_APP_URL: migration app URL
 - TERMS_API_URL: TC Terms API Base URL
 - COPILOT_RESOURCE_ROLE_IDS: copilot resource role ids allowed to upload attachment
 - HEALTH_CHECK_TIMEOUT: health check timeout in milliseconds
diff --git a/config/default.js b/config/default.js
index 0ef0a204..9700d193 100644
--- a/config/default.js
+++ b/config/default.js
@@ -59,6 +59,7 @@ module.exports = {
   PROJECTS_API_URL: process.env.PROJECTS_API_URL || 'http://localhost:4000/v5/projects',
   TERMS_API_URL: process.env.TERMS_API_URL || 'http://localhost:4000/v5/terms',
   CUSTOMER_PAYMENTS_URL: process.env.CUSTOMER_PAYMENTS_URL || 'https://api.topcoder-dev.com/v5/customer-payments',
+  CHALLENGE_MIGRATION_APP_URL: process.env.CHALLENGE_MIGRATION_APP_URL || 'https://api.topcoder-dev.com/v5/challenge-migration',
   // copilot resource role ids allowed to upload attachment
   COPILOT_RESOURCE_ROLE_IDS: process.env.COPILOT_RESOURCE_ROLE_IDS
     ? process.env.COPILOT_RESOURCE_ROLE_IDS.split(',') : ['10ba038e-48da-487b-96e8-8d3b99b6d18b'],
diff --git a/src/common/helper.js b/src/common/helper.js
index 0bae077b..c349ecfb 100644
--- a/src/common/helper.js
+++ b/src/common/helper.js
@@ -463,6 +463,16 @@ async function createSelfServiceProject (name, description, type, token) {
   return _.get(res, 'data.id')
 }
 
+/**
+ * Get project id by roundId
+ * @param {String} roundId the round id
+ */
+async function getProjectIdByRoundId (roundId) {
+  const url = `${config.CHALLENGE_MIGRATION_APP_URL}/getChallengeProjectId/${roundId}`
+  const res = await axios.get(url)
+  return _.get(res, 'data.projectId')
+}
+
 /**
  * Get project payment
  * @param {String} projectId the project id
@@ -1292,6 +1302,7 @@ module.exports = {
   ensureUserCanModifyChallenge,
   userHasFullAccess,
   sumOfPrizes,
+  getProjectIdByRoundId,
   getGroupById,
   getChallengeSubmissions,
   getMemberById,
diff --git a/src/controllers/ChallengeController.js b/src/controllers/ChallengeController.js
index 02d759f8..b4c87681 100644
--- a/src/controllers/ChallengeController.js
+++ b/src/controllers/ChallengeController.js
@@ -12,7 +12,17 @@ const logger = require('../common/logger')
  * @param {Object} res the response
  */
 async function searchChallenges (req, res) {
-  const result = await service.searchChallenges(req.authUser, { ...req.query, ...req.body })
+  let result = await service.searchChallenges(req.authUser, { ...req.query, ...req.body })
+  if (!result.total && req.query.legacyId) {
+    // maybe the legacyId is roundId for mm challenge
+    // mm challenge use projectId as legacyId
+    try {
+      const legacyId = await helper.getProjectIdByRoundId(req.query.legacyId)
+      result = await service.searchChallenges(req.authUser, { ...req.query, ...req.body, legacyId })
+    } catch (e) {
+      logger.debug(`Failed to get projectId  with error: ${e.message}`)
+    }
+  }
   helper.setResHeaders(req, res, result)
   res.send(result.result)
 }