diff --git a/LinqStudy.Test/LinqToObject/SequenceEqualTest.cs b/LinqStudy.Test/LinqToObject/SequenceEqualTest.cs
new file mode 100644
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+++ b/LinqStudy.Test/LinqToObject/SequenceEqualTest.cs
@@ -0,0 +1,248 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using System.Linq;
+using Xunit;
+using FluentAssertions;
+using System.Collections;
+
+namespace LinqStudy.Test.LinqToObject
+{
+    /// <summary>
+    /// 序列相等
+    /// </summary>
+    public class SequenceEqualTest
+    {
+        /// <summary>
+        ///  SequenceEqual
+        ///  序列相等比较：所含项数量相同、内容相同、位置相同、引用类型则引用相同的对象，则两个序列相等。
+        /// </summary>
+        [Fact]
+        public void SequenceEqual_Test()
+        {
+            List<Person> sequence = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+                new Person(){Id=1,Name="王五",Age=20},
+            };
+            List<Person> sequence1 = sequence;
+
+            List<Person> sequence2 = sequence;
+
+            Assert.True(sequence1.SequenceEqual(sequence2));
+        }
+
+        /// <summary>
+        /// 引用类型相等：项数量相同、内容相同、位置相同、引用对象相同
+        /// </summary>
+        [Fact]
+        public void SequenceEqual_Query_Test()
+        {
+            List<Person> sequence = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=2,Name="李四",Age=30},
+                new Person(){Id=3,Name="王五",Age=40},
+            };
+
+            //查询结果相同，引用对象也相同。
+            var sequence1 = sequence.Where(p => p.Id > 2);
+            var sequence2 = sequence.Where(p => p.Age > 30);
+
+            Assert.True(sequence1.SequenceEqual(sequence2));
+        }
+
+        /// <summary>
+        /// 值类型相等：项数量相同、内容相同、位置相同
+        /// </summary>
+        [Fact]
+        public void SequenceEqual_ValueType_Test()
+        {
+
+            List<int> sequence1 = new List<int>() { 1, 2, 3 };
+
+            List<int> sequence2 = new List<int>() { 1, 2, 3 };
+
+            Assert.True(sequence1.SequenceEqual(sequence2));
+        }
+
+        /// <summary>
+        /// 引用不同
+        /// </summary>
+        [Fact]
+        public void SequenceEqual_Reference_Test()
+        {
+            List<Person> sequence1 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+            };
+
+            List<Person> sequence2 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+            };
+
+            Assert.False(sequence1.SequenceEqual(sequence2));
+        }
+
+        /// <summary>
+        /// 内容不一样
+        /// </summary>
+        [Fact]
+        public void SequenceEqual_Content_Test()
+        {
+            List<Person> sequence1 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+                new Person(){Id=1,Name="王五",Age=20},
+            };
+
+            List<Person> sequence2 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三2",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+                new Person(){Id=1,Name="王五",Age=20},
+            };
+
+            Assert.False(sequence1.SequenceEqual(sequence2));
+        }
+
+        /// <summary>
+        /// 数量不一样
+        /// </summary>
+        [Fact]
+        public void SequenceEqual_Count_Test()
+        {
+            List<Person> sequence1 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+            };
+
+            List<Person> sequence2 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+            };
+
+            Assert.False(sequence1.SequenceEqual(sequence2));
+        }
+
+        /// <summary>
+        /// 位置不同
+        /// </summary>
+        [Fact]
+        public void SequenceEqual_Position_Test()
+        {
+            List<Person> sequence1 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+            };
+
+            List<Person> sequence2 = new List<Person>()
+            {
+                new Person(){Id=1,Name="李四",Age=20},
+                new Person(){Id=1,Name="张三",Age=20},
+            };
+
+            Assert.False(sequence1.SequenceEqual(sequence2));
+        }
+
+        /// <summary>
+        /// 重载比较方法,实现自动义比较
+        /// </summary>
+        [Fact]
+        public void SequenceEqual_OverrideEquals_Test()
+        {
+            List<Student> sequence1 = new List<Student>()
+            {
+                new Student(){Id=1,Name="张三",Age=20},
+                new Student(){Id=1,Name="李四",Age=20},
+            };
+
+            List<Student> sequence2 = new List<Student>()
+            {
+                new Student(){Id=1,Name="李四",Age=20},
+                new Student(){Id=1,Name="张三",Age=20},
+            };
+
+            Assert.True(sequence1.SequenceEqual(sequence2));
+        }
+
+        /// <summary>
+        /// 提供自定义比较器
+        /// </summary>
+        [Fact]
+        public void Test()
+        {
+            List<Person> sequence1 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+            };
+
+            List<Person> sequence2 = new List<Person>()
+            {
+                new Person(){Id=1,Name="张三",Age=20},
+                new Person(){Id=1,Name="李四",Age=20},
+            };
+
+            Assert.True(sequence1.SequenceEqual(sequence2, new PersonEqual()));
+        }
+
+        /// <summary>
+        /// 自定义Person比较器
+        /// Id相同，则表示同一个对象
+        /// </summary>
+        private class PersonEqual : IEqualityComparer<Person>
+        {
+            bool IEqualityComparer<Person>.Equals(Person x, Person y)
+            {
+                if (x==null || y==null)
+                {
+                    return false;
+                }
+
+                return x.Id == y.Id;
+            }
+
+            int IEqualityComparer<Person>.GetHashCode(Person obj)
+            {
+                return obj.Id.GetHashCode();
+            }
+        }
+
+        /// <summary>
+        /// 重写比较方法
+        /// </summary>
+        private class Student
+        {
+            public int Id { get; set; }
+
+            public string Name { get; set; }
+
+            public int Age { get; set; }
+
+            public override bool Equals(object obj)
+            {
+                var other = obj as Student;
+                if (other == null)
+                {
+                    return false;
+                }
+
+                return Id==other.Id;
+            }
+
+            public override int GetHashCode()
+            {
+                return this.Id.GetHashCode();
+            }
+        }
+    }
+}