diff --git a/internal/service/yumigiftchallenge/config.go b/internal/service/yumigiftchallenge/config.go
index c701308..70a38be 100644
--- a/internal/service/yumigiftchallenge/config.go
+++ b/internal/service/yumigiftchallenge/config.go
@@ -4,12 +4,15 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"math"
+	"math/big"
 	"net/http"
 	"regexp"
 	"sort"
 	"strings"
 	"time"
 
+	"chatapp3-golang/internal/integration"
 	"chatapp3-golang/internal/model"
 	"chatapp3-golang/internal/utils"
 
@@ -607,8 +610,9 @@ func (s *Service) buildRewardSnapshots(ctx context.Context, activity model.YumiG
 		})
 		for index, item := range detail.RewardConfigList {
 			rewardConfigID := int64(item.ID)
-			if rewardConfigID <= 0 || strings.TrimSpace(item.Type) == "" || int64(item.Quantity) <= 0 {
-				return nil, NewAppError(http.StatusBadRequest, "invalid_reward_item", fmt.Sprintf("reward group %d contains an invalid item", groupID))
+			normalizedItem, normalizeErr := normalizeFrozenRewardItem(groupID, index, item)
+			if normalizeErr != nil {
+				return nil, normalizeErr
 			}
 			key := fmt.Sprintf("%d:%d", groupID, rewardConfigID)
 			if _, exists := seen[key]; exists {
@@ -626,8 +630,8 @@ func (s *Service) buildRewardSnapshots(ctx context.Context, activity model.YumiG
 			displayName := truncate(firstNonBlank(item.Name, item.BadgeName, item.Remark), 500)
 			rows = append(rows, model.YumiGiftChallengeRewardSnapshot{
 				ID: id, ActivityID: activity.ID, ResourceGroupID: groupID, RewardConfigID: rewardConfigID,
-				RewardType: strings.ToUpper(strings.TrimSpace(item.Type)), DetailType: strings.TrimSpace(item.DetailType),
-				Content: strings.TrimSpace(item.Content), Quantity: int64(item.Quantity), SortOrder: sortOrder,
+				RewardType: normalizedItem.rewardType, DetailType: normalizedItem.detailType,
+				Content: normalizedItem.content, Quantity: normalizedItem.quantity, SortOrder: sortOrder,
 				Remark: strings.TrimSpace(item.Remark), Cover: strings.TrimSpace(item.Cover),
 				SourceURL: strings.TrimSpace(item.SourceURL), DisplayName: displayName, CreateTime: now,
 			})
@@ -639,6 +643,71 @@ func (s *Service) buildRewardSnapshots(ctx context.Context, activity model.YumiG
 	return rows, nil
 }
 
+type frozenRewardItem struct {
+	rewardType string
+	detailType string
+	content    string
+	quantity   int64
+}
+
+func normalizeFrozenRewardItem(groupID int64, index int, item integration.RewardGroupItem) (frozenRewardItem, error) {
+	result := frozenRewardItem{
+		rewardType: strings.ToUpper(strings.TrimSpace(item.Type)),
+		detailType: strings.TrimSpace(item.DetailType),
+		content:    strings.TrimSpace(item.Content),
+		quantity:   int64(item.Quantity),
+	}
+	itemLabel := fmt.Sprintf("reward group %d item %d (id=%d, type=%s, quantity=%d)",
+		groupID, index+1, int64(item.ID), result.rewardType, result.quantity)
+	if int64(item.ID) <= 0 {
+		return frozenRewardItem{}, NewAppError(http.StatusBadRequest, "invalid_reward_item", itemLabel+" has an invalid id")
+	}
+	if result.rewardType == "" {
+		return frozenRewardItem{}, NewAppError(http.StatusBadRequest, "invalid_reward_item", itemLabel+" has an empty type")
+	}
+
+	// 奖励组详情为了展示会把原始 PROPS 改写成 AVATAR_FRAME/RIDE 等子类型，
+	// 但冻结发奖接口只按基础类型分流；这里还原 PROPS，同时保留子类型用于展示和通知。
+	switch result.rewardType {
+	case "AVATAR_FRAME", "RIDE", "NOBLE_VIP", "THEME", "LAYOUT", "CHAT_BUBBLE",
+		"FLOAT_PICTURE", "DATA_CARD", "VIP_EFFECT_IMAGE", "RED_PACKET":
+		if result.detailType == "" || strings.EqualFold(result.detailType, "PROPS") {
+			result.detailType = result.rewardType
+		}
+		result.rewardType = "PROPS"
+	case "ROOM_BADGE", "HONOR_ACTIVITY":
+		if result.detailType == "" || strings.EqualFold(result.detailType, "BADGE") {
+			result.detailType = result.rewardType
+		}
+		result.rewardType = "BADGE"
+	}
+
+	if result.quantity < 0 || result.quantity > math.MaxInt32 {
+		return frozenRewardItem{}, NewAppError(http.StatusBadRequest, "invalid_reward_item", itemLabel+" has an out-of-range quantity")
+	}
+	// 所有当前可发奖类型的 content 都是正整数资源 ID 或整数币值。启用时先拒绝空值、
+	// 非数字和零值，避免活动完成后才在 Java 发奖链路留下 UNKNOWN 记录。
+	contentNumber, contentOK := new(big.Int).SetString(result.content, 10)
+	if !contentOK || contentNumber.Sign() <= 0 {
+		return frozenRewardItem{}, NewAppError(http.StatusBadRequest, "invalid_reward_item", itemLabel+" has invalid content")
+	}
+
+	switch result.rewardType {
+	case "GOLD", "DIAMOND":
+		// 币值由 content 承载，旧奖励组按契约把 quantity 保存为 0；不能把币值复制到
+		// quantity，否则既破坏冻结事实，也会与 Java 实际按 content 发币的逻辑不一致。
+	case "BADGE":
+		// quantity=0 是 Java 的永久徽章语义，正数才表示临时徽章天数。
+	case "PROPS", "GIFT", "EMOJI", "FRAGMENTS", "CUSTOMIZE", "PROP_COUPON":
+		if result.quantity == 0 {
+			return frozenRewardItem{}, NewAppError(http.StatusBadRequest, "invalid_reward_item", itemLabel+" requires a positive quantity")
+		}
+	default:
+		return frozenRewardItem{}, NewAppError(http.StatusBadRequest, "unsupported_reward_item", itemLabel+" is not supported by the reward delivery service")
+	}
+	return result, nil
+}
+
 func firstNonBlank(values ...string) string {
 	for _, value := range values {
 		if value = strings.TrimSpace(value); value != "" {