diff --git a/src/constants.rs b/src/constants.rs
index 0ed38ce..59eca08 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -6,6 +6,7 @@ pub const PREFIX_TESTNET: &str = "ckt";
 pub const NETWORK_MAINNET: &str = "ckb";
 pub const NETWORK_TESTNET: &str = "ckb_testnet";
 pub const NETWORK_STAGING: &str = "ckb_staging";
+pub const NETWORK_PREVIEW: &str = "ckb_preview";
 pub const NETWORK_DEV: &str = "ckb_dev";
 
 pub const SECP_SIGNATURE_SIZE: usize = 65;
diff --git a/src/test_util.rs b/src/test_util.rs
index cffecd1..77f5f1b 100644
--- a/src/test_util.rs
+++ b/src/test_util.rs
@@ -355,7 +355,8 @@ impl Context {
     /// Run all scripts in the transaction in ckb-vm
     pub fn verify_scripts(&self, tx: TransactionView) -> Result<Cycle, Error> {
         let mock_tx = self.to_mock_tx(tx.data());
-        let resource = Resource::from_both(&mock_tx, &mut DummyLoader).map_err(Error::VerifyScript)?;
+        let resource =
+            Resource::from_both(&mock_tx, &mut DummyLoader).map_err(Error::VerifyScript)?;
         let rtx = resolve_transaction(tx, &mut HashSet::new(), &resource, &resource)
             .map_err(|err| Error::VerifyScript(format!("Resolve transaction error: {:?}", err)))?;
         let consensus = ConsensusBuilder::default()
diff --git a/src/types/network_type.rs b/src/types/network_type.rs
index 2d92b78..95ba27a 100644
--- a/src/types/network_type.rs
+++ b/src/types/network_type.rs
@@ -3,7 +3,8 @@ use std::fmt;
 use serde_derive::{Deserialize, Serialize};
 
 use crate::constants::{
-    NETWORK_DEV, NETWORK_MAINNET, NETWORK_STAGING, NETWORK_TESTNET, PREFIX_MAINNET, PREFIX_TESTNET,
+    NETWORK_DEV, NETWORK_MAINNET, NETWORK_PREVIEW, NETWORK_STAGING, NETWORK_TESTNET,
+    PREFIX_MAINNET, PREFIX_TESTNET,
 };
 
 #[derive(Hash, Eq, PartialEq, Debug, Clone, Copy, Serialize, Deserialize)]
@@ -11,6 +12,7 @@ pub enum NetworkType {
     Mainnet,
     Testnet,
     Staging,
+    Preview,
     Dev,
 }
 
@@ -28,6 +30,7 @@ impl NetworkType {
             NetworkType::Mainnet => PREFIX_MAINNET,
             NetworkType::Testnet => PREFIX_TESTNET,
             NetworkType::Staging => PREFIX_TESTNET,
+            NetworkType::Preview => PREFIX_TESTNET,
             NetworkType::Dev => PREFIX_TESTNET,
         }
     }
@@ -37,6 +40,7 @@ impl NetworkType {
             NETWORK_MAINNET => Some(NetworkType::Mainnet),
             NETWORK_TESTNET => Some(NetworkType::Testnet),
             NETWORK_STAGING => Some(NetworkType::Staging),
+            NETWORK_PREVIEW => Some(NetworkType::Preview),
             NETWORK_DEV => Some(NetworkType::Dev),
             _ => None,
         }
@@ -47,6 +51,7 @@ impl NetworkType {
             NetworkType::Mainnet => NETWORK_MAINNET,
             NetworkType::Testnet => NETWORK_TESTNET,
             NetworkType::Staging => NETWORK_STAGING,
+            NetworkType::Preview => NETWORK_PREVIEW,
             NetworkType::Dev => NETWORK_DEV,
         }
     }
@@ -73,6 +78,7 @@ impl NetworkInfo {
             NetworkType::Mainnet => Some(Self::mainnet()),
             NetworkType::Testnet => Some(Self::testnet()),
             NetworkType::Staging => None,
+            NetworkType::Preview => None,
             NetworkType::Dev => None,
         }
     }