Now，the double-circuit parallel transmission lines are general arranged in 220kV power system．There are some special problem in the protection＇s configuration other than the one way line．According to the specific circumstances of the line protection running in Hebei Southern Electric Power Network, this paper carries on the analysis, comparison and the proof to the protection＇s configuration of 220kV longchong- double-circuit parallel transmission line. It proposes a feasible protection solution and carries on the technology and economical comparison for the protecting path. It also studies the problem in reclosure when the double-circuit parallel transmission lines are fast excised because of the dead-zone fault happening between the circuit breaker and TA, and the solution is put forward.