diff --git a/custom/conf/app.ini.sample b/custom/conf/app.ini.sample
index f087e9913b..12e50e8cb7 100644
--- a/custom/conf/app.ini.sample
+++ b/custom/conf/app.ini.sample
@@ -67,6 +67,8 @@ EXPLORE_PAGING_NUM = 20
 ISSUE_PAGING_NUM = 10
 ; Number of maximum commits displayed in one activity feed
 FEED_MAX_COMMIT_NUM = 5
+; Number of maximum commits displayed in commit graph.
+GRAPH_MAX_COMMIT_NUM = 100
 ; Value of `theme-color` meta tag, used by Android >= 5.0
 ; An invalid color like "none" or "disable" will have the default style
 ; More info: https://developers.google.com/web/updates/2014/11/Support-for-theme-color-in-Chrome-39-for-Android
diff --git a/docs/content/doc/advanced/config-cheat-sheet.en-us.md b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
index 5ed2ce43e7..29489d8855 100644
--- a/docs/content/doc/advanced/config-cheat-sheet.en-us.md
+++ b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
@@ -68,6 +68,7 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `EXPLORE_PAGING_NUM`: **20**: Number of repositories that are shown in one explore page.
 - `ISSUE_PAGING_NUM`: **10**: Number of issues that are shown in one page (for all pages that list issues).
 - `FEED_MAX_COMMIT_NUM`: **5**: Number of maximum commits shown in one activity feed.
+- `GRAPH_MAX_COMMIT_NUM`: **100**: Number of maximum commits shown in the commit graph.
 - `DEFAULT_THEME`: **gitea**: \[gitea, arc-green\]: Set the default theme for the Gitea install.
 
 ### UI - Admin (`ui.admin`)
diff --git a/models/graph.go b/models/graph.go
index 8ecea9c093..90b9ff11f8 100644
--- a/models/graph.go
+++ b/models/graph.go
@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"code.gitea.io/git"
+	"code.gitea.io/gitea/modules/setting"
 )
 
 // GraphItem represent one commit, or one relation in timeline
@@ -41,7 +42,7 @@ func GetCommitGraph(r *git.Repository) (GraphItems, error) {
 		"--all",
 		"-C",
 		"-M",
-		"-n 100",
+		fmt.Sprintf("-n %d", setting.UI.GraphMaxCommitNum),
 		"--date=iso",
 		fmt.Sprintf("--pretty=format:%s", format),
 	)
diff --git a/modules/setting/setting.go b/modules/setting/setting.go
index b44ba4d11b..396dec2546 100644
--- a/modules/setting/setting.go
+++ b/modules/setting/setting.go
@@ -276,6 +276,7 @@ var (
 		IssuePagingNum      int
 		RepoSearchPagingNum int
 		FeedMaxCommitNum    int
+		GraphMaxCommitNum   int
 		ReactionMaxUserNum  int
 		ThemeColorMetaTag   string
 		MaxDisplayFileSize  int64
@@ -301,6 +302,7 @@ var (
 		IssuePagingNum:      10,
 		RepoSearchPagingNum: 10,
 		FeedMaxCommitNum:    5,
+		GraphMaxCommitNum:   100,
 		ReactionMaxUserNum:  10,
 		ThemeColorMetaTag:   `#6cc644`,
 		MaxDisplayFileSize:  8388608,