diff --git a/core/blockchain.go b/core/blockchain.go
index c1d15350fd2f7..c9b80bc2fffb1 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -2492,3 +2492,8 @@ func (bc *BlockChain) SetBlockValidatorAndProcessorForTesting(v Validator, p Pro
 func (bc *BlockChain) SetTrieFlushInterval(interval time.Duration) {
 	bc.flushInterval.Store(int64(interval))
 }
+
+// GetTrieFlushInterval gets the in-memroy tries flush interval
+func (bc *BlockChain) GetTrieFlushInterval() time.Duration {
+	return time.Duration(bc.flushInterval.Load())
+}
diff --git a/eth/api_debug.go b/eth/api_debug.go
index 7cf0239174fcd..4dd48508f6819 100644
--- a/eth/api_debug.go
+++ b/eth/api_debug.go
@@ -406,6 +406,8 @@ func (api *DebugAPI) GetAccessibleState(from, to rpc.BlockNumber) (uint64, error
 
 // SetTrieFlushInterval configures how often in-memory tries are persisted
 // to disk. The value is in terms of block processing time, not wall clock.
+// If the value is shorter than the block generation time, or even 0 or negative,
+// the node will flush trie after processing each block (effectively archive mode).
 func (api *DebugAPI) SetTrieFlushInterval(interval string) error {
 	t, err := time.ParseDuration(interval)
 	if err != nil {
@@ -414,3 +416,8 @@ func (api *DebugAPI) SetTrieFlushInterval(interval string) error {
 	api.eth.blockchain.SetTrieFlushInterval(t)
 	return nil
 }
+
+// GetTrieFlushInterval gets the current value of in-memory trie flush interval
+func (api *DebugAPI) GetTrieFlushInterval() string {
+	return api.eth.blockchain.GetTrieFlushInterval().String()
+}
diff --git a/internal/web3ext/web3ext.go b/internal/web3ext/web3ext.go
index ea4abef1f6f8b..c171709586e6f 100644
--- a/internal/web3ext/web3ext.go
+++ b/internal/web3ext/web3ext.go
@@ -495,6 +495,11 @@ web3._extend({
 			call: 'debug_setTrieFlushInterval',
 			params: 1
 		}),
+		new web3._extend.Method({
+			name: 'getTrieFlushInterval',
+			call: 'debug_getTrieFlushInterval',
+			params: 0
+		}),
 	],
 	properties: []
 });