After built the basic physics, I tried to combine those physics into the body of the ragdoll. The body will consist of several spheres that I called it a node. The idea to only use several spheres to form a body rather than human body because of the ragdoll will be stretch as the result of spring physics and it will not suitable for the human behaviour.
All the sphere will contain bounce physics to create a bouncing effect when it touch the ground. Also to connect all the sphere, I used spring physics and fixed joint. Unity has provided the function to create Fixed joint physic, the purpose of fixed joint is to make the ragdoll still have human form and not move as random when used spring physics. Beside fixed joint other spheres will use spring joint to connect with each other.
As the result