Sports injuries infringement cases should not be a civil legal norms "extra space". They apply the principle of fault liability. The application of civil law in the field of sports injuries will affect the autonomy of sport. In order to prevent excessive interference on the sports field, the victim’s consent and assumption of risk play a harmonic function between sports autonomy and the civil law intervention. Both have their own scope and apply in order. The effect of these two exemptions is not the same.