diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index da268cfd8d..6321e06c12 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -972,7 +972,7 @@ Please note that --` + MetricsHTTPFlag.Name + ` must be set to start the server.
 	// Blob setting
 	BlobExtraReserveFlag = &cli.Uint64Flag{
 		Name:     "blob.extra-reserve",
-		Usage:    "Extra reserve threshold for blob, blob never expires when 0 is set, default 28800",
+		Usage:    "Extra reserve threshold for blob, blob never expires when 0 is set, default 14400",
 		Value:    params.DefaultExtraReserveForBlobRequests,
 		Category: flags.MiscCategory,
 	}
diff --git a/eth/ethconfig/config.go b/eth/ethconfig/config.go
index 49bc350727..e0f81acfa7 100644
--- a/eth/ethconfig/config.go
+++ b/eth/ethconfig/config.go
@@ -69,7 +69,7 @@ var Defaults = Config{
 	RPCEVMTimeout:      5 * time.Second,
 	GPO:                FullNodeGPO,
 	RPCTxFeeCap:        1,                                         // 1 ether
-	BlobExtraReserve:   params.DefaultExtraReserveForBlobRequests, // Extra reserve threshold for blob, blob never expires when -1 is set, default 28800
+	BlobExtraReserve:   params.DefaultExtraReserveForBlobRequests, // Extra reserve threshold for blob, blob never expires when -1 is set, default 14400
 }
 
 //go:generate go run github.com/fjl/gencodec -type Config -formats toml -out gen_config.go
diff --git a/params/protocol_params.go b/params/protocol_params.go
index 0262cdca77..4e84659ebc 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -176,8 +176,16 @@ const (
 )
 
 var (
-	MinBlocksForBlobRequests           uint64 = 524288              // it keeps blob data available for ~18.2 days in local, ref: https://github.com/bnb-chain/BEPs/blob/master/BEPs/BEP-336.md#51-parameters.
-	DefaultExtraReserveForBlobRequests uint64 = 1 * (24 * 3600) / 3 // it adds more time for expired blobs for some request cases, like expiry blob when remote peer is syncing, default 1 day.
+	// The factor to adjust blob reserve period for Oasys.
+	// Oasys blocktime(6s) / BSC blocktime(3s) = 2
+	divisionFactorForOasys uint64 = 2
+
+	// it keeps blob data available for ~18.2 days in local, ref: https://github.com/bnb-chain/BEPs/blob/master/BEPs/BEP-336.md#51-parameters.
+	// Same as the default blob reserve period in Ethereum (4096 epochs).
+	MinBlocksForBlobRequests uint64 = 524288 / divisionFactorForOasys
+
+	// it adds more time for expired blobs for some request cases, like expiry blob when remote peer is syncing, default 1 day.
+	DefaultExtraReserveForBlobRequests uint64 = 1 * (24 * 3600) / 3 / divisionFactorForOasys
 )
 
 // Gas discount table for BLS12-381 G1 and G2 multi exponentiation operations