diff --git a/Project/db/mcd.md b/Project/db/mcd.md
new file mode 100755
index 0000000..7d4a9ed
--- /dev/null
+++ b/Project/db/mcd.md
@@ -0,0 +1,58 @@
+@startuml
+card User [
+    User
+    --
+    <u>id
+    password
+    email
+    name
+    surname
+    nickname
+    image
+    extratime
+]
+
+card Vocabulary [
+    Vocabulary
+    --
+    <u>id
+    name
+    image
+]
+
+card Group [
+    Group
+    --
+    <u>id
+    num
+    year
+    sector
+]
+
+card Role [
+    Role
+    --
+    <u>id
+    name
+]
+
+usecase Create
+
+User "0,n" -- Create 
+Create -- "1,1" Vocabulary
+
+usecase Practice
+
+Group "0,n" -- Practice
+Practice -- "1,n" Vocabulary
+
+usecase Belong
+
+User "1,1" -- Belong
+Belong -- "1,n" Group
+
+usecase Be
+
+User "1,n" -- Be
+Be -- "1,1" Role
+@enduml
\ No newline at end of file
diff --git a/Project/db/mld.md b/Project/db/mld.md
new file mode 100755
index 0000000..cdf0895
--- /dev/null
+++ b/Project/db/mld.md
@@ -0,0 +1,61 @@
+@startuml
+
+card Group [
+    Group
+    --
+    <u>id
+    num
+    year
+    sector
+]
+
+card User [
+    User
+    --
+    <u>id
+    password
+    email
+    name
+    surname
+    nickname
+    image
+    extratime
+    ~#groupID
+]
+User --> Group
+
+card Vocabulary [
+    Vocabulary
+    --
+    <u>id
+    name
+    image
+    ~#creator
+]
+Vocabulary --> User
+
+card Role [
+    Role
+    --
+    <u>id
+    name
+]
+card Practice [
+    Practice
+    --
+    <u>#vocabID
+    <u>#groupID
+]
+Practice --> Vocabulary
+Practice --> Group
+
+card Be [
+    Be
+    --
+    <u>#userID
+    <u>#roleID
+]
+Be --> User
+Be --> Role
+
+@enduml
\ No newline at end of file