diff --git a/Animal b/Animal
new file mode 100644
index 0000000..e69de29
diff --git a/Animal.cpp b/Animal.cpp
new file mode 100644
index 0000000..8b2914b
--- /dev/null
+++ b/Animal.cpp
@@ -0,0 +1,18 @@
+#include "Animal.h"
+#include<iostream>
+#include<bitset>
+using namespace std;
+
+Animal::Animal(float mt,int dim):mutation_rate(mt),fitness(0),dimension(dim){
+	//TODO 在这里将个体的位串初始化
+}
+
+void Animal::variation(){
+
+}
+
+float Animal::get_fitness(){
+
+}
+
+
diff --git a/Animal.h b/Animal.h
new file mode 100644
index 0000000..9f6cc9d
--- /dev/null
+++ b/Animal.h
@@ -0,0 +1,15 @@
+#ifndef  Animal_H_
+#define Animal_H_
+class Animal{
+public:
+	Animal(float,int);
+	virtual ~Animal();
+	virtual void variation();
+	float get_fitness();
+private:
+	float mutation_rate,fitness;
+	int individual_code;
+	int dimension;
+
+};
+#endif
\ No newline at end of file
diff --git a/Zoo.h b/Zoo.h
new file mode 100644
index 0000000..7153a41
--- /dev/null
+++ b/Zoo.h
@@ -0,0 +1,27 @@
+
+/*
+definition of Zoo
+*/
+#ifndef ZOO_H_
+#define ZOO_H_
+#include<vector>
+#include "Animal.h"
+class Zoo{
+public:
+	Zoo(float,float,int,int,float = 0.05);
+	~Zoo();
+	Animal& choose(); //根据个体适应度选择个体 一次选出一只
+	void exchange(Animal&, Animal&); //交换两个个体的基因
+	float get_fitness(); //计算整个种群的适应度
+	void add_animal(Animal&);
+	std::vector<Animal> get_animals();
+	void set_zoo_size(int);
+	int get_zoo_size();
+private:
+	std::vector<Animal> animals;
+	int zoo_size; //种群数量
+	float mutation_rate; //变异率
+	int animal_dimension; //动物的维度
+	float bound_low,bound_up;//搜索域
+};
+#endif
\ No newline at end of file