diff --git a/dto/openai_image.go b/dto/openai_image.go
index 927c37bc7..bf35b0b12 100644
--- a/dto/openai_image.go
+++ b/dto/openai_image.go
@@ -169,7 +169,7 @@ type ImageResponse struct {
 	Extra   any         `json:"extra,omitempty"`
 }
 type ImageData struct {
-	Url           string `json:"url,omitempty"`
-	B64Json       string `json:"b64_json,omitempty"`
-	RevisedPrompt string `json:"revised_prompt,omitempty"`
+	Url           string `json:"url"`
+	B64Json       string `json:"b64_json"`
+	RevisedPrompt string `json:"revised_prompt"`
 }
diff --git a/relay/channel/gemini/adaptor.go b/relay/channel/gemini/adaptor.go
index d71c369bf..b522ca1be 100644
--- a/relay/channel/gemini/adaptor.go
+++ b/relay/channel/gemini/adaptor.go
@@ -1,7 +1,6 @@
 package gemini
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -56,102 +55,9 @@ func (a *Adaptor) ConvertAudioRequest(c *gin.Context, info *relaycommon.RelayInf
 	return nil, errors.New("not implemented")
 }
 
-type ImageConfig struct {
-	AspectRatio string `json:"aspectRatio,omitempty"`
-	ImageSize   string `json:"imageSize,omitempty"`
-}
-
-type SizeMapping struct {
-	AspectRatio string
-	ImageSize   string
-}
-
-type QualityMapping struct {
-	Standard string
-	HD       string
-	High     string
-	FourK    string
-	Auto     string
-}
-
-func getImageSizeMapping() QualityMapping {
-	return QualityMapping{
-		Standard: "1K",
-		HD:       "2K",
-		High:     "2K",
-		FourK:    "4K",
-		Auto:     "1K",
-	}
-}
-
-func getSizeMappings() map[string]SizeMapping {
-	return map[string]SizeMapping{
-		"1536x1024": {AspectRatio: "3:2", ImageSize: ""},
-		"1024x1536": {AspectRatio: "2:3", ImageSize: ""},
-		"1024x1792": {AspectRatio: "9:16", ImageSize: ""},
-		"1792x1024": {AspectRatio: "16:9", ImageSize: ""},
-		"2048x2048": {AspectRatio: "", ImageSize: "2K"},
-		"4096x4096": {AspectRatio: "", ImageSize: "4K"},
-	}
-}
-
-func processSizeParameters(size, quality string) ImageConfig {
-	config := ImageConfig{} // 默认为空值
-
-	if size != "" {
-		if strings.Contains(size, ":") {
-			config.AspectRatio = size // 直接设置，不与默认值比较
-		} else {
-			if mapping, exists := getSizeMappings()[size]; exists {
-				if mapping.AspectRatio != "" {
-					config.AspectRatio = mapping.AspectRatio
-				}
-				if mapping.ImageSize != "" {
-					config.ImageSize = mapping.ImageSize
-				}
-			}
-		}
-	}
-
-	if quality != "" {
-		qualityMapping := getImageSizeMapping()
-		switch strings.ToLower(strings.TrimSpace(quality)) {
-		case "hd", "high":
-			config.ImageSize = qualityMapping.HD
-		case "4k":
-			config.ImageSize = qualityMapping.FourK
-		case "standard", "medium", "low", "auto", "1k":
-			config.ImageSize = qualityMapping.Standard
-		}
-	}
-
-	return config
-}
-
 func (a *Adaptor) ConvertImageRequest(c *gin.Context, info *relaycommon.RelayInfo, request dto.ImageRequest) (any, error) {
-	if strings.HasPrefix(info.UpstreamModelName, "gemini-3-pro-image") {
-		chatRequest := dto.GeneralOpenAIRequest{
-			Model: request.Model,
-			Messages: []dto.Message{
-				{Role: "user", Content: request.Prompt},
-			},
-			N: int(request.N),
-		}
-
-		config := processSizeParameters(strings.TrimSpace(request.Size), request.Quality)
-		googleGenerationConfig := map[string]interface{}{
-			"response_modalities": []string{"TEXT", "IMAGE"},
-			"image_config":        config,
-		}
-
-		extraBody := map[string]interface{}{
-			"google": map[string]interface{}{
-				"generation_config": googleGenerationConfig,
-			},
-		}
-		chatRequest.ExtraBody, _ = json.Marshal(extraBody)
-
-		return a.ConvertOpenAIRequest(c, info, &chatRequest)
+	if !strings.HasPrefix(info.UpstreamModelName, "imagen") {
+		return nil, errors.New("not supported model for image generation")
 	}
 
 	// convert size to aspect ratio but allow user to specify aspect ratio
@@ -161,8 +67,17 @@ func (a *Adaptor) ConvertImageRequest(c *gin.Context, info *relaycommon.RelayInf
 		if strings.Contains(size, ":") {
 			aspectRatio = size
 		} else {
-			if mapping, exists := getSizeMappings()[size]; exists && mapping.AspectRatio != "" {
-				aspectRatio = mapping.AspectRatio
+			switch size {
+			case "256x256", "512x512", "1024x1024":
+				aspectRatio = "1:1"
+			case "1536x1024":
+				aspectRatio = "3:2"
+			case "1024x1536":
+				aspectRatio = "2:3"
+			case "1024x1792":
+				aspectRatio = "9:16"
+			case "1792x1024":
+				aspectRatio = "16:9"
 			}
 		}
 	}
@@ -343,10 +258,6 @@ func (a *Adaptor) DoResponse(c *gin.Context, resp *http.Response, info *relaycom
 		return GeminiImageHandler(c, info, resp)
 	}
 
-	if model_setting.IsGeminiModelSupportImagine(info.UpstreamModelName) {
-		return ChatImageHandler(c, info, resp)
-	}
-
 	// check if the model is an embedding model
 	if strings.HasPrefix(info.UpstreamModelName, "text-embedding") ||
 		strings.HasPrefix(info.UpstreamModelName, "embedding") ||
diff --git a/relay/channel/gemini/relay-gemini.go b/relay/channel/gemini/relay-gemini.go
index 0628b105d..ab9e8e337 100644
--- a/relay/channel/gemini/relay-gemini.go
+++ b/relay/channel/gemini/relay-gemini.go
@@ -1264,70 +1264,3 @@ func GeminiImageHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.
 
 	return usage, nil
 }
-
-func convertToOaiImageResponse(geminiResponse *dto.GeminiChatResponse) (*dto.ImageResponse, error) {
-	openAIResponse := &dto.ImageResponse{
-		Created: common.GetTimestamp(),
-		Data:    make([]dto.ImageData, 0),
-	}
-
-	// extract images from candidates' inlineData
-	for _, candidate := range geminiResponse.Candidates {
-		for _, part := range candidate.Content.Parts {
-			if part.InlineData != nil && strings.HasPrefix(part.InlineData.MimeType, "image") {
-				openAIResponse.Data = append(openAIResponse.Data, dto.ImageData{
-					B64Json: part.InlineData.Data,
-				})
-			}
-		}
-	}
-
-	if len(openAIResponse.Data) == 0 {
-		return nil, errors.New("no images found in response")
-	}
-
-	return openAIResponse, nil
-}
-
-func ChatImageHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Response) (*dto.Usage, *types.NewAPIError) {
-	responseBody, readErr := io.ReadAll(resp.Body)
-	if readErr != nil {
-		return nil, types.NewOpenAIError(readErr, types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
-	}
-	service.CloseResponseBodyGracefully(resp)
-
-	if common.DebugEnabled {
-		println("ChatImageHandler response:", string(responseBody))
-	}
-
-	var geminiResponse dto.GeminiChatResponse
-	if jsonErr := common.Unmarshal(responseBody, &geminiResponse); jsonErr != nil {
-		return nil, types.NewOpenAIError(jsonErr, types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
-	}
-
-	if len(geminiResponse.Candidates) == 0 {
-		return nil, types.NewOpenAIError(errors.New("no images generated"), types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
-	}
-
-	openAIResponse, err := convertToOaiImageResponse(&geminiResponse)
-	if err != nil {
-		return nil, types.NewOpenAIError(err, types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
-	}
-
-	jsonResponse, jsonErr := json.Marshal(openAIResponse)
-	if jsonErr != nil {
-		return nil, types.NewError(jsonErr, types.ErrorCodeBadResponseBody)
-	}
-
-	c.Writer.Header().Set("Content-Type", "application/json")
-	c.Writer.WriteHeader(resp.StatusCode)
-	_, _ = c.Writer.Write(jsonResponse)
-
-	usage := &dto.Usage{
-		PromptTokens:     geminiResponse.UsageMetadata.PromptTokenCount,
-		CompletionTokens: geminiResponse.UsageMetadata.CandidatesTokenCount,
-		TotalTokens:      geminiResponse.UsageMetadata.TotalTokenCount,
-	}
-
-	return usage, nil
-}
diff --git a/setting/model_setting/gemini.go b/setting/model_setting/gemini.go
index 2731dcba4..55f721e95 100644
--- a/setting/model_setting/gemini.go
+++ b/setting/model_setting/gemini.go
@@ -26,10 +26,6 @@ var defaultGeminiSettings = GeminiSettings{
 	SupportedImagineModels: []string{
 		"gemini-2.0-flash-exp-image-generation",
 		"gemini-2.0-flash-exp",
-		"gemini-3-pro-image-preview",
-		"gemini-2.5-flash-image",
-		"nano-banana",
-		"nano-banana-pro",
 	},
 	ThinkingAdapterEnabled:                false,
 	ThinkingAdapterBudgetTokensPercentage: 0.6,