diff --git a/assets/default-avatar.png b/assets/default-avatar.png
new file mode 100644
index 0000000..2634889
Binary files /dev/null and b/assets/default-avatar.png differ
diff --git a/assets/default-background.png b/assets/default-background.png
new file mode 100644
index 0000000..f65ab43
Binary files /dev/null and b/assets/default-background.png differ
diff --git a/layouts/partials/header.html b/layouts/partials/header.html
index 2a0cae3..a2debbc 100644
--- a/layouts/partials/header.html
+++ b/layouts/partials/header.html
@@ -1,4 +1,11 @@
-<div class="jumbotron" style="background-image: url({{ .Site.Params.cover }});">
+{{ $background_path :=  "default-background.png" }}
+{{ with .Site.Params.cover }}
+    {{ $background_path = . }}
+{{ end }}
+{{ if resources.Get $background_path }}
+    {{ $background_path = (resources.Get $background_path).Permalink }}
+{{ end }}
+<div class="jumbotron" style="background-image: url({{ $background_path }});">
     <div class="container">
         <div class="site-title">{{ .Site.Params.title }}</div>
         <p class="signature">{{ .Site.Params.signature }}</p>
diff --git a/layouts/partials/row.html b/layouts/partials/row.html
index ebc748b..82ec017 100644
--- a/layouts/partials/row.html
+++ b/layouts/partials/row.html
@@ -25,12 +25,17 @@
                 {{/* user info */}}
                 <div class="user-info">
                     <div class="avatar-block">
-                        {{ with $page.Params.avatar }}
-                        <img src='{{ . }}' class="avatar">
-                        {{ else }}
-                        {{/* fixme check whether the default avatar path is url or not--> */}}
-                        <img src='{{ $page.Site.BaseURL }}/{{ $page.Site.Params.avatar }}' class="avatar">
+                        {{ $avatar_path :=  "default-avatar.png" }}
+                        {{ with .Site.Params.avatar }}
+                            {{ $avatar_path = . }}
                         {{ end }}
+                        {{ with $page.Params.avatar }}
+                            {{ $avatar_path = . }}
+                        {{ end }}
+                        {{ if resources.Get $avatar_path }}
+                            {{ $avatar_path = (resources.Get $avatar_path).Permalink }}
+                        {{ end }}
+                        <img src='{{ $avatar_path }}' class="avatar">
                     </div>
                     <div class="intro">
                         <div class="name">
diff --git a/static/img/default_avatar.png b/static/img/default_avatar.png
deleted file mode 100644
index 4eb3e8c..0000000
Binary files a/static/img/default_avatar.png and /dev/null differ