diff --git a/libraries/app/include/graphene/app/database_api.hpp b/libraries/app/include/graphene/app/database_api.hpp
index 7d9ffde8..843d6af5 100644
--- a/libraries/app/include/graphene/app/database_api.hpp
+++ b/libraries/app/include/graphene/app/database_api.hpp
@@ -119,8 +119,7 @@ struct gpos_info {
    asset award;
    share_type total_amount;
    uint32_t current_subperiod;
-   fc::time_point_sec last_voted_time;
-   
+   fc::time_point_sec last_voted_time;   
 };
 
 /**
diff --git a/libraries/chain/account_evaluator.cpp b/libraries/chain/account_evaluator.cpp
index b29c169c..3185c456 100644
--- a/libraries/chain/account_evaluator.cpp
+++ b/libraries/chain/account_evaluator.cpp
@@ -284,8 +284,10 @@ void_result account_update_evaluator::do_apply( const account_update_operation&
    {
       d.modify( acnt->statistics( d ), [&]( account_statistics_object& aso )
       {
-         //if((o.new_options->votes != acnt->options.votes ||
-         //    o.new_options->voting_account != acnt->options.voting_account))
+         fc::optional< bool > flag = o.extensions.value.update_last_voting_time;
+         if((o.new_options->votes != acnt->options.votes ||
+             o.new_options->voting_account != acnt->options.voting_account) ||
+             flag)
             aso.last_vote_time = d.head_block_time();
       } );
    }
diff --git a/libraries/chain/include/graphene/chain/protocol/account.hpp b/libraries/chain/include/graphene/chain/protocol/account.hpp
index 6d13a4d3..a0e43ad0 100644
--- a/libraries/chain/include/graphene/chain/protocol/account.hpp
+++ b/libraries/chain/include/graphene/chain/protocol/account.hpp
@@ -140,6 +140,7 @@ namespace graphene { namespace chain {
          optional< void_t >            null_ext;
          optional< special_authority > owner_special_authority;
          optional< special_authority > active_special_authority;
+         optional< bool >              update_last_voting_time = false;
       };
 
       struct fee_parameters_type
diff --git a/libraries/wallet/wallet.cpp b/libraries/wallet/wallet.cpp
index 5b867c47..5bc53bdc 100644
--- a/libraries/wallet/wallet.cpp
+++ b/libraries/wallet/wallet.cpp
@@ -2087,11 +2087,22 @@ public:
       fc::optional<committee_member_object> committee_member_obj = _remote_db->get_committee_member_by_account(committee_member_owner_account_id);
       if (!committee_member_obj)
          FC_THROW("Account ${committee_member} is not registered as a committee_member", ("committee_member", committee_member));
+
+      bool update_vote_time = false;
+
       if (approve)
       {
+         account_id_type stake_account = get_account_id(voting_account);
+         const auto gpos_info = _remote_db->get_gpos_info(stake_account);
+         const auto vesting_subperiod = _remote_db->get_global_properties().parameters.gpos_subperiod();
+         const auto gpos_start_time = fc::time_point_sec(_remote_db->get_global_properties().parameters.gpos_period_start());
+         const auto subperiod_start_time = gpos_start_time.sec_since_epoch() + (gpos_info.current_subperiod - 1) * vesting_subperiod;
+
          auto insert_result = voting_account_object.options.votes.insert(committee_member_obj->vote_id);
-         if (!insert_result.second)
-            FC_THROW("Account ${account} was already voting for committee_member ${committee_member}", ("account", voting_account)("committee_member", committee_member));
+         if (!insert_result.second && (gpos_info.last_voted_time.sec_since_epoch() >= subperiod_start_time))
+            FC_THROW("Account ${account} was already voting for committee_member ${committee_member} in the current GPOS sub-period", ("account", voting_account)("committee_member", committee_member));
+         else
+            update_vote_time = true;   //Allow user to vote in each sub-period(Update voting time, which is reference in calculating VF)
       }
       else
       {
@@ -2102,6 +2113,7 @@ public:
       account_update_operation account_update_op;
       account_update_op.account = voting_account_object.id;
       account_update_op.new_options = voting_account_object.options;
+      account_update_op.extensions.value.update_last_voting_time = update_vote_time;
 
       signed_transaction tx;
       tx.operations.push_back( account_update_op );
@@ -2129,6 +2141,8 @@ public:
       fc::optional<witness_object> witness_obj = _remote_db->get_witness_by_account(witness_owner_account_id);
       if (!witness_obj)
          FC_THROW("Account ${witness} is not registered as a witness", ("witness", witness));
+
+      bool update_vote_time = false;
       if (approve)
       {
          account_id_type stake_account = get_account_id(voting_account);
@@ -2139,7 +2153,9 @@ public:
 
          auto insert_result = voting_account_object.options.votes.insert(witness_obj->vote_id);
          if (!insert_result.second && (gpos_info.last_voted_time.sec_since_epoch() >= subperiod_start_time))
-            FC_THROW("Account ${account} was already voting for witness ${witness}", ("account", voting_account)("witness", witness));
+            FC_THROW("Account ${account} was already voting for witness ${witness} in the current GPOS sub-period", ("account", voting_account)("witness", witness));
+         else
+            update_vote_time = true;   //Allow user to vote in each sub-period(Update voting time, which is reference in calculating VF)
       }
       else
       {
@@ -2147,9 +2163,11 @@ public:
          if (!votes_removed)
             FC_THROW("Account ${account} is already not voting for witness ${witness}", ("account", voting_account)("witness", witness));
       }
+      
       account_update_operation account_update_op;
       account_update_op.account = voting_account_object.id;
       account_update_op.new_options = voting_account_object.options;
+      account_update_op.extensions.value.update_last_voting_time = update_vote_time;
 
       signed_transaction tx;
       tx.operations.push_back( account_update_op );