Social innovations in response to solving social problems and needs are new and innovative solutions that are more effective, more efficient, or even fairer than previous ones. Charities and NGOs are just one of the actors of social innovation. The nature of their innovations is altruistic. These innovation need to more PUBLIC PARTICIPATION to be success. Successful engagemnt of people in social innovations depends on how and why people participate in these event. In this regard, the present study has examined the sociology, psychology and social biology in the field of altruism, as well as interviewing by the experts with PARTICIPATION in the good and innovative charities, using the method of thematic analysis to identify the dimensions of PUBLIC PARTICIPATION in social innovation. In the end, the main dimentions of PUBLIC PARTICIPATION were introduced in social innovation, awareness-raising, strengthening the identity and social cohesion of the community, facilitating and attracting voluntary PARTICIPATION, learning and enhancing skills, building trust and improving interaction and communicating between main actors as the main dimensions of PUBLIC PARTICIPATION.