The invention discloses a normal brake system used for an airplane and having take-off line brake capability. The normal brake system comprises a hydraulic brake valve, an electric valve, an electro-hydraulic servo valve, an anti-slip control box, a hydraulic switch and a speed sensor, wherein the hydraulic brake valve is mounted near a pedal mechanism under a bottom plate of a cockpit, controlled by operation of stepping on a brake pedal by a pilot and used for outputting a required brake pressure; the electric valve is mounted on a hydraulic pipeline at the downstream part of the hydraulic brake valve; the electro-hydraulic servo valve is mounted on a hydraulic pipeline at the downstream part of the electric valve; the anti-slip control box is mounted in a main landing gear cabin and powered by a power supply on the airplane; the hydraulic switch is mounted on a hydraulic pipeline between the hydraulic brake valve and a first oil inlet of the electric valve. The normal brake system can meet a braking demand of an existing normal brake system of the airplane on a take-off line, is reasonable in structure, simple, convenient, feasible, consistent with a man-machine engineering principle and favorable for reducing the burden of the pilot, and eliminates accident potentials caused by false operation of switching on a take-off line brake switch.