The utility model discloses an electricity liquid servo braking system all with multiple mode, this electricity liquid servo braking system are all including brake pedal, manpower jar, electric liquid servo -cylinder, brake master cylinder, liquid storage pot, master cylinder pressure sensor, hydraulic control unit, wheel cylinder, motor, ecu, brake pedal stroke sensor. The utility model discloses an electricity liquid servo -cylinder and manpower jar be independence or superposition effect in brake master cylinder's piston mutually to apply the braking to whole or partial wheel. The utility model discloses an electricity liquid servo braking system multiple mode all makes it can be according to the work of braking demand in active brake mode, drive -by -wire braking mode, the helping hand braking mode of difference to the spare manpower brake function that became invalid has. The utility model has the advantages of: have multiple braking mode, optimum braking mode is selected to the braking demand in the time of can be according to practical application, and the reliability is high, the inefficacy protective capacities is strong.