This work focuses on the importance of play as a symbolization support for hospitalized children. Play is a way for children to feel that they exist, as S. Freud, D. W. Winnicott, M. Klein, F. Dolto and other clinicians have argued. I was happy to see that children give a very important place to play, despite the fact that in hospitals play is secondary, after care. In her book "La cause des enfants", Françoise Dolto explains that it is by playing that children learn to adapt to reality. The imaginary supported by the game helps the child to defend itself from the drama of reality "the games of control around the fantasies of life and death participate in an acceptance of reality". Thus, it is thanks to the games that the children support then the reality, the restriction of their freedom. The impossibility of playing for a child would be tantamount to removing all defense against daily violence. I wondered if it was not important, even essential, to give a significant role to play in the hospital?