The basic features are :

1. Supremacy of the constitution ehich states in article 7 of the constitution. 

2. Democracy which states in the preamble. 

3. Republican government which states in the article  1 of the constitution. 

4. Independence of judiciary which states in article 22 of the constitution. 

5. Unitary state which mentioned article 1 of the constitution. 

6. Seperation of power which mentioned in Article 22 of the Constitution. 

7.Fundamental rights which mentioned in from Article 26 to 47 ( A) of the constitution.