The analysis of equality in the civil process, through the parity of arms, imposes a historical reconstruction of the legal institutes, seeking to better understand the problems of our present. The parity of arms has had greater recognition and attention in criminal matters as a component of the fair trial. Hence the need to initially locate the problem of equality in the courts, and then, in a second stage, seek to identify the barriers that inhibit its fullness and propose solutions to overcome it. Important in this sense is the determination of the content and limits of the parity of arms in the civil process, identifying the basic mechanisms for its development. Through a dogmatic and comparative study, the hypothesis of the imperative of equality of arms in the civil process is tried to be verified.