diff --git a/internal/oci/instance.go b/internal/oci/instance.go
index e177390..691f9c8 100644
--- a/internal/oci/instance.go
+++ b/internal/oci/instance.go
@@ -397,9 +397,10 @@ func fillInstanceIPs(ctx context.Context, cc core.ComputeClient, vn core.Virtual
 		return
 	}
 	var (
-		wg  sync.WaitGroup
-		mu  sync.Mutex
-		sem = make(chan struct{}, 8)
+		wg          sync.WaitGroup
+		mu          sync.Mutex
+		sem         = make(chan struct{}, 8)
+		primarySeen = make(map[*Instance]bool)
 	)
 	for _, att := range attResp.Items {
 		inst, ok := active[deref(att.InstanceId)]
@@ -416,16 +417,30 @@ func fillInstanceIPs(ctx context.Context, cc core.ComputeClient, vn core.Virtual
 				return
 			}
 			mu.Lock()
-			inst.SubnetID = deref(vnicResp.SubnetId)
-			inst.PrivateIP = deref(vnicResp.PrivateIp)
-			inst.PublicIP = deref(vnicResp.PublicIp)
-			inst.Ipv6Addresses = vnicResp.Ipv6Addresses
+			applyVnicAddrs(inst, vnicResp.Vnic, primarySeen)
 			mu.Unlock()
 		}(att.VnicId, inst)
 	}
 	wg.Wait()
 }
 
+// applyVnicAddrs 将 VNIC 地址写入实例。多网卡实例以主网卡为准：
+// 主网卡返回前先用先到的网卡兜底，主网卡到达后覆盖并锁定，避免并发
+// 完成顺序决定展示结果。调用方需持有保护 inst 与 primarySeen 的锁。
+func applyVnicAddrs(inst *Instance, v core.Vnic, primarySeen map[*Instance]bool) {
+	isPrimary := v.IsPrimary != nil && *v.IsPrimary
+	if !isPrimary && (primarySeen[inst] || inst.SubnetID != "") {
+		return
+	}
+	inst.SubnetID = deref(v.SubnetId)
+	inst.PrivateIP = deref(v.PrivateIp)
+	inst.PublicIP = deref(v.PublicIp)
+	inst.Ipv6Addresses = v.Ipv6Addresses
+	if isPrimary {
+		primarySeen[inst] = true
+	}
+}
+
 func toInstance(inst core.Instance) Instance {
 	out := Instance{
 		ID:                 deref(inst.Id),
diff --git a/internal/oci/instance_test.go b/internal/oci/instance_test.go
index ce9a91b..41dcd9b 100644
--- a/internal/oci/instance_test.go
+++ b/internal/oci/instance_test.go
@@ -5,9 +5,51 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/oracle/oci-go-sdk/v65/common"
 	"github.com/oracle/oci-go-sdk/v65/core"
 )
 
+func TestApplyVnicAddrs(t *testing.T) {
+	primary := core.Vnic{
+		IsPrimary: common.Bool(true),
+		SubnetId:  common.String("sub-a"),
+		PrivateIp: common.String("10.0.0.2"),
+		PublicIp:  common.String("1.1.1.1"),
+	}
+	secondary := core.Vnic{
+		IsPrimary: common.Bool(false),
+		SubnetId:  common.String("sub-b"),
+		PrivateIp: common.String("10.0.0.9"),
+	}
+	secondary2 := core.Vnic{
+		SubnetId:  common.String("sub-c"),
+		PrivateIp: common.String("10.0.0.7"),
+	}
+	tests := []struct {
+		name        string
+		order       []core.Vnic
+		wantPrivate string
+		wantSubnet  string
+	}{
+		{name: "主卡先到不被次卡覆盖", order: []core.Vnic{primary, secondary}, wantPrivate: "10.0.0.2", wantSubnet: "sub-a"},
+		{name: "次卡先兜底主卡后覆盖", order: []core.Vnic{secondary, primary}, wantPrivate: "10.0.0.2", wantSubnet: "sub-a"},
+		{name: "无主卡时先到者保留", order: []core.Vnic{secondary, secondary2}, wantPrivate: "10.0.0.9", wantSubnet: "sub-b"},
+		{name: "仅次卡也能兜底", order: []core.Vnic{secondary2}, wantPrivate: "10.0.0.7", wantSubnet: "sub-c"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			inst := &Instance{}
+			seen := make(map[*Instance]bool)
+			for _, v := range tt.order {
+				applyVnicAddrs(inst, v, seen)
+			}
+			if inst.PrivateIP != tt.wantPrivate || inst.SubnetID != tt.wantSubnet {
+				t.Errorf("got (%q, %q), want (%q, %q)", inst.PrivateIP, inst.SubnetID, tt.wantPrivate, tt.wantSubnet)
+			}
+		})
+	}
+}
+
 func TestShellSingleQuote(t *testing.T) {
 	tests := []struct {
 		name string