diff --git a/articles/models.py b/articles/models.py
index 6b20219..816ea8b 100644
--- a/articles/models.py
+++ b/articles/models.py
@@ -1 +1,65 @@
-# Create your models here.
+from datetime import datetime
+
+from django.db import models
+from django.urls import reverse_lazy
+from django.utils.text import slugify
+from markdownx.models import MarkdownxField
+from markdownx.utils import markdownify
+from tagulous.models import TagField
+
+
+class Category(models.Model):
+    title = models.CharField(max_length=40, unique=True)
+    slug = models.SlugField(max_length=40, unique=True)
+    introduction = models.TextField(blank=True, null=True)
+
+    def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
+        if not self.slug:
+            self.slug = slugify(self.title)
+        return super(Category, self).save()
+
+    def get_absolute_url(self):
+        return reverse_lazy('articles:list_category', args=[self.slug])
+
+    def __str__(self):
+        return self.title
+
+    class Meta:
+        ordering = ['title']
+
+
+class Article(models.Model):
+    title = models.CharField(max_length=200)
+    subtitle = models.CharField(max_length=200, blank=True, null=True)
+    slug = models.SlugField(max_length=200, unique=True)
+    category = models.ForeignKey(Category, on_delete=models.PROTECT, related_name='articles')
+    introduction = models.TextField(blank=True, null=True)
+    body = MarkdownxField()
+    summary = MarkdownxField(blank=True, null=True)
+    tags = TagField(force_lowercase=True,
+                    get_absolute_url=lambda tag: reverse_lazy('articles:list_tag', kwargs={'tag': tag.slug}))
+    created = models.DateTimeField(auto_now_add=True)
+    updated = models.DateTimeField(auto_now_add=True)
+    is_published = models.BooleanField(default=False)
+    is_updated = models.BooleanField(default=False)
+    is_featured = models.BooleanField(default=False)
+
+    def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
+        if not self.slug:
+            self.slug = slugify(self.title)
+        if self.is_updated:
+            self.updated = datetime.now()
+            self.is_updated = False
+        return super(Article, self).save()
+
+    def get_absolute_url(self):
+        return reverse_lazy('articles:detail', args=[self.category.slug, self.slug])
+
+    def body_as_markdown(self):
+        return markdownify(self.body)
+
+    def __str__(self):
+        return self.title
+
+    class Meta:
+        ordering = ['-created']