diff --git a/lib/cocoapods-binary/Integration.rb b/lib/cocoapods-binary/Integration.rb
index dab6aa7..734a7eb 100644
--- a/lib/cocoapods-binary/Integration.rb
+++ b/lib/cocoapods-binary/Integration.rb
@@ -14,7 +14,7 @@
 
 # Provide a special "download" process for prebuilded pods.
 #
-# As the frameworks is already exsited in local folder. We
+# As the frameworks is already existed in local folder. We
 # just create a symlink to the original target folder.
 #
 module Pod
@@ -114,7 +114,7 @@ def remove_target_files_if_needed
             changes = Pod::Prebuild::Passer.prebuild_pods_changes
             updated_names = []
             if changes == nil
-                updated_names = PrebuildSandbox.from_standard_sandbox(self.sandbox).exsited_framework_pod_names
+                updated_names = PrebuildSandbox.from_standard_sandbox(self.sandbox).existed_framework_pod_names
             else
                 added = changes.added
                 changed = changes.changed 
diff --git a/lib/cocoapods-binary/Prebuild.rb b/lib/cocoapods-binary/Prebuild.rb
index 77bc834..5137df3 100644
--- a/lib/cocoapods-binary/Prebuild.rb
+++ b/lib/cocoapods-binary/Prebuild.rb
@@ -45,9 +45,9 @@ def have_exact_prebuild_cache?
             unchanged = changes.unchanged
             deleted = changes.deleted 
             
-            exsited_framework_pod_names = sandbox.exsited_framework_pod_names
+            existed_framework_pod_names = sandbox.existed_framework_pod_names
             missing = unchanged.select do |pod_name|
-                not exsited_framework_pod_names.include?(pod_name)
+                not existed_framework_pod_names.include?(pod_name)
             end
 
             needed = (added + changed + deleted + missing)
@@ -58,7 +58,7 @@ def have_exact_prebuild_cache?
         # The install method when have completed cache
         def install_when_cache_hit!
             # just print log
-            self.sandbox.exsited_framework_target_names.each do |name|
+            self.sandbox.existed_framework_target_names.each do |name|
                 UI.puts "Using #{name}"
             end
         end
@@ -82,11 +82,11 @@ def prebuild_frameworks!
                 deleted = changes.deleted 
     
                 existed_framework_folder.mkdir unless existed_framework_folder.exist?
-                exsited_framework_pod_names = sandbox.exsited_framework_pod_names
+                existed_framework_pod_names = sandbox.existed_framework_pod_names
     
                 # additions
                 missing = unchanged.select do |pod_name|
-                    not exsited_framework_pod_names.include?(pod_name)
+                    not existed_framework_pod_names.include?(pod_name)
                 end
 
 
@@ -191,7 +191,7 @@ def prebuild_frameworks!
             # Remove useless files
             # remove useless pods
             all_needed_names = self.pod_targets.map(&:name).uniq
-            useless_target_names = sandbox.exsited_framework_target_names.reject do |name| 
+            useless_target_names = sandbox.existed_framework_target_names.reject do |name| 
                 all_needed_names.include? name
             end
             useless_target_names.each do |name|
diff --git a/lib/cocoapods-binary/helper/prebuild_sandbox.rb b/lib/cocoapods-binary/helper/prebuild_sandbox.rb
index cbae242..a46b9b8 100644
--- a/lib/cocoapods-binary/helper/prebuild_sandbox.rb
+++ b/lib/cocoapods-binary/helper/prebuild_sandbox.rb
@@ -28,14 +28,14 @@ def framework_folder_path_for_target_name(name)
         end
 
         
-        def exsited_framework_target_names
-            exsited_framework_name_pairs.map {|pair| pair[0]}.uniq
+        def existed_framework_target_names
+            existed_framework_name_pairs.map {|pair| pair[0]}.uniq
         end
-        def exsited_framework_pod_names
-            exsited_framework_name_pairs.map {|pair| pair[1]}.uniq
+        def existed_framework_pod_names
+            existed_framework_name_pairs.map {|pair| pair[1]}.uniq
         end
         def existed_target_names_for_pod_name(pod_name)
-            exsited_framework_name_pairs.select {|pair| pair[1] == pod_name }.map { |pair| pair[0]}
+            existed_framework_name_pairs.select {|pair| pair[1] == pod_name }.map { |pair| pair[0]}
         end
 
 
@@ -59,7 +59,7 @@ def pod_name_for_target_folder(target_folder_path)
         end
 
         # Array<[target_name, pod_name]>
-        def exsited_framework_name_pairs
+        def existed_framework_name_pairs
             return [] unless generate_framework_path.exist?
             generate_framework_path.children().map do |framework_path|
                 if framework_path.directory? && (not framework_path.children.empty?)