A method, an apparatus and a system for invoking a local service component by a browser are provided. The method includes receiving, by a client terminal, a connection request based on a cross-domain communication protocol initiated by a browser terminal; performing, by the client terminal, validity verification of the connection request; and if the connection request passes the validity verification, establishing, by the client terminal, a communication connection with the browser terminal based on the cross-domain communication protocol to allow the browser terminal to invoke a local service component. The present disclosure can achieve an invocation of a local service component by most mainstream browsers, and has a better security of communications.