diff --git a/lib/ckb/api.rb b/lib/ckb/api.rb
index f016f9c0..f644f20f 100644
--- a/lib/ckb/api.rb
+++ b/lib/ckb/api.rb
@@ -161,6 +161,18 @@ def tx_pool_info
       rpc.tx_pool_info
     end
 
+    # @return [CKB::Types::ChainInfo]
+    def get_blockchain_info
+      Types::ChainInfo.from_h(
+        rpc.get_blockchain_info
+      )
+    end
+
+    # @return [CKB::Types::PeerState[]]
+    def get_peers_state
+      rpc.get_peers_state.map { |peer| Types::PeerState.from_h(peer) }
+    end
+
     def inspect
       "\#<API@#{rpc.uri}>"
     end
diff --git a/lib/ckb/rpc.rb b/lib/ckb/rpc.rb
index ecdf7e80..efae23e0 100644
--- a/lib/ckb/rpc.rb
+++ b/lib/ckb/rpc.rb
@@ -92,6 +92,14 @@ def tx_pool_info
       rpc_request("tx_pool_info")
     end
 
+    def get_blockchain_info
+      rpc_request("get_blockchain_info")
+    end
+
+    def get_peers_state
+      rpc_request("get_peers_state")
+    end
+
     def inspect
       "\#<RPC@#{uri}>"
     end
diff --git a/lib/ckb/types/chain_info.rb b/lib/ckb/types/chain_info.rb
new file mode 100644
index 00000000..f603817a
--- /dev/null
+++ b/lib/ckb/types/chain_info.rb
@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+module CKB
+  module Types
+    class ChainInfo
+      attr_reader :is_initial_block_download, :epoch, :difficulty, :median_time, :chain, :warnings
+
+      # @param is_initialize_block_download [Boolean]
+      # @param epoch [String] number
+      # @param difficulty [String] 0x...
+      # @param median_time [String] timestamp
+      # @param chain [String]
+      # @param warnings [String]
+      def initialize(
+        is_initial_block_download:,
+        epoch:,
+        difficulty:,
+        median_time:,
+        chain:,
+        warnings:
+      )
+        @is_initial_block_download = is_initial_block_download
+        @epoch = epoch
+        @difficulty = difficulty
+        @median_time = median_time
+        @chain = chain
+        @warnings = warnings
+      end
+
+      def to_h
+        {
+          is_initial_block_download: @is_initial_block_download,
+          epoch: @epoch,
+          difficulty: @difficulty,
+          median_time: @median_time,
+          chain: @chain,
+          warnings: @warnings
+        }
+      end
+
+      def self.from_h(hash)
+        return if hash.nil?
+
+        new(
+          is_initial_block_download: hash[:is_initial_block_download],
+          epoch: hash[:epoch],
+          difficulty: hash[:difficulty],
+          median_time: hash[:median_time],
+          chain: hash[:chain],
+          warnings: hash[:warnings]
+        )
+      end
+    end
+  end
+end
diff --git a/lib/ckb/types/peer_state.rb b/lib/ckb/types/peer_state.rb
new file mode 100644
index 00000000..5d527b33
--- /dev/null
+++ b/lib/ckb/types/peer_state.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module CKB
+  module Types
+    class PeerState
+      attr_reader :last_updated, :blocks_in_flight, :peer
+
+      # @param last_updated [String]
+      # @param block_in_flight [String] number
+      # @param peer [String] number
+      def initialize(last_updated:, blocks_in_flight:, peer:)
+        @last_updated = last_updated
+        @blocks_in_flight = blocks_in_flight
+        @peer = peer
+      end
+
+      def to_h
+        {
+          last_updated: @last_updated,
+          blocks_in_flight: @blocks_in_flight,
+          peer: peer
+        }
+      end
+
+      def self.from_h(hash)
+        return if hash.nil?
+
+        new(
+          last_updated: hash[:last_updated],
+          blocks_in_flight: hash[:blocks_in_flight],
+          peer: hash[:peer]
+        )
+      end
+    end
+  end
+end
diff --git a/lib/ckb/types/types.rb b/lib/ckb/types/types.rb
index 0ba80d0f..df9bc201 100644
--- a/lib/ckb/types/types.rb
+++ b/lib/ckb/types/types.rb
@@ -14,6 +14,8 @@
 require_relative "tx_status"
 require_relative "witness"
 require_relative "epoch"
+require_relative "chain_info"
+require_relative "peer_state"
 
 module CKB
   module Types
diff --git a/spec/ckb/api_spec.rb b/spec/ckb/api_spec.rb
index 9509c35a..e89cfdeb 100644
--- a/spec/ckb/api_spec.rb
+++ b/spec/ckb/api_spec.rb
@@ -93,4 +93,15 @@
     result = api.tx_pool_info
     expect(result[:pending] >= 0).to be true
   end
+
+  it "get blockchain info" do
+    result = api.get_blockchain_info
+    expect(result).to be_a(Types::ChainInfo)
+    expect(result.epoch.to_i >= 0).to be true
+  end
+
+  it "get peers state" do
+    result = api.get_peers_state
+    expect(result).to be_an(Array)
+  end
 end
diff --git a/spec/ckb/types/block_test.rb b/spec/ckb/types/block_spec.rb
similarity index 100%
rename from spec/ckb/types/block_test.rb
rename to spec/ckb/types/block_spec.rb
diff --git a/spec/ckb/types/chain_info_spec.rb b/spec/ckb/types/chain_info_spec.rb
new file mode 100644
index 00000000..52e258ae
--- /dev/null
+++ b/spec/ckb/types/chain_info_spec.rb
@@ -0,0 +1,17 @@
+RSpec.describe CKB::Types::ChainInfo do
+  let(:chain_info_h) do
+    {
+      "is_initial_block_download": false,
+      "epoch": "0",
+      "difficulty": "0x100",
+      "median_time": "1557287480008",
+      "chain": "ckb_dev",
+      "warnings": ""
+   }
+  end
+
+  it "from h" do
+    chain_info = CKB::Types::ChainInfo::from_h(chain_info_h)
+    expect(chain_info).to be_a(CKB::Types::ChainInfo)
+  end
+end
diff --git a/spec/ckb/types/peer_state_spec.rb b/spec/ckb/types/peer_state_spec.rb
new file mode 100644
index 00000000..e7aaa9cc
--- /dev/null
+++ b/spec/ckb/types/peer_state_spec.rb
@@ -0,0 +1,14 @@
+RSpec.describe CKB::Types::PeerState do
+  let(:peer_state_h) do
+    {
+      "last_updated": "1557289448237",
+      "blocks_in_flight": "86",
+      "peer": "1"
+   }
+  end
+
+  it "from h" do
+    peer_state = CKB::Types::PeerState.from_h(peer_state_h)
+    expect(peer_state).to be_a(CKB::Types::PeerState)
+  end
+end
diff --git a/spec/ckb/types/script_test.rb b/spec/ckb/types/script_spec.rb
similarity index 97%
rename from spec/ckb/types/script_test.rb
rename to spec/ckb/types/script_spec.rb
index 4726d733..148752a5 100644
--- a/spec/ckb/types/script_test.rb
+++ b/spec/ckb/types/script_spec.rb
@@ -16,7 +16,7 @@
 
   it "to_hash" do
     expect(
-      lock.to_hash
+      always_success.to_hash
     ).to eq always_success_type_hash
   end
 end