diff --git a/x/gov/types/params.go b/x/gov/types/params.go
index c199076a..089ca415 100644
--- a/x/gov/types/params.go
+++ b/x/gov/types/params.go
@@ -118,6 +118,17 @@ func (p Params) ValidateBasic() error {
 		return fmt.Errorf("veto threshold too large: %s", vetoThreshold)
 	}
 
+	minInitialDepositRatio, err := sdk.NewDecFromStr(p.MinInitialDepositRatio)
+	if err != nil {
+		return fmt.Errorf("invalid minInitialDepositRatio string: %w", err)
+	}
+	if minInitialDepositRatio.IsNegative() {
+		return fmt.Errorf("min initial deposit ratio must be zero or positive: %s", minInitialDepositRatio)
+	}
+	if minInitialDepositRatio.GT(math.LegacyOneDec()) {
+		return fmt.Errorf("min initial deposit ratio too large: %s", minInitialDepositRatio)
+	}
+
 	if p.VotingPeriod.Seconds() <= 0 {
 		return fmt.Errorf("voting period must be positive: %s", p.VotingPeriod)
 	}
diff --git a/x/gov/types/params_test.go b/x/gov/types/params_test.go
new file mode 100644
index 00000000..c727b7ed
--- /dev/null
+++ b/x/gov/types/params_test.go
@@ -0,0 +1,70 @@
+package types_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/initia-labs/initia/x/gov/types"
+)
+
+func Test_Params(t *testing.T) {
+	params := types.DefaultParams()
+	require.NoError(t, params.ValidateBasic())
+
+	_emergencyMinDeposit := params.EmergencyMinDeposit
+	params.EmergencyMinDeposit = []sdk.Coin{{
+		Denom:  "foo",
+		Amount: sdk.NewInt(-1),
+	}}
+	require.Error(t, params.ValidateBasic())
+
+	params.EmergencyMinDeposit = _emergencyMinDeposit
+
+	_minDeposit := params.MinDeposit
+	params.MinDeposit = []sdk.Coin{{
+		Denom:  "foo",
+		Amount: sdk.NewInt(-1),
+	}}
+	require.Error(t, params.ValidateBasic())
+
+	params.MinDeposit = _minDeposit
+
+	_maxDepositPeriod := params.MaxDepositPeriod
+	params.MaxDepositPeriod = 0
+	require.Error(t, params.ValidateBasic())
+
+	params.MaxDepositPeriod = _maxDepositPeriod
+
+	_minInitialDepositRatio := params.MinInitialDepositRatio
+	params.MinInitialDepositRatio = "-1"
+	require.Error(t, params.ValidateBasic())
+
+	params.MinInitialDepositRatio = _minInitialDepositRatio
+
+	_quorum := params.Quorum
+	params.Quorum = "-1"
+	require.Error(t, params.ValidateBasic())
+
+	params.Quorum = _quorum
+
+	_threshold := params.Threshold
+	params.Threshold = "-1"
+	require.Error(t, params.ValidateBasic())
+
+	params.Threshold = _threshold
+
+	_vetoThreshold := params.VetoThreshold
+	params.VetoThreshold = "-1"
+	require.Error(t, params.ValidateBasic())
+
+	params.VetoThreshold = _vetoThreshold
+
+	_votingPeriod := params.VotingPeriod
+	params.VotingPeriod = 0
+	require.Error(t, params.ValidateBasic())
+
+	params.VotingPeriod = _votingPeriod
+	require.NoError(t, params.ValidateBasic())
+}