The invention relates to the technical field of electric power, in particular to a circuit system and an electric vehicle. The circuit system comprises a main circuit and multiple power distribution modules. Each power distribution module is electrically connected with the main circuit and comprises an over-current protection device, a switching device and a detection module. Each over-current protection device comprises a first end electrically connected with the main circuit and a second end connected with the input end of the corresponding switching device. The output ends of the switchingdevices are connected with power use devices. The detection modules are connected with the first ends and the second ends of the over-current protection devices so as to detect the resistance values between the first ends and the second ends of the over-current protection devices. The detection modules are further connected with the input ends and the output ends of the switching devices so as todetect the voltage values between the input ends and the output ends of the switching devices. Through the above arrangement, the problem that a development period is long due to the fact that the circuit system needs to be redesigned when the power use devices are changed can be effectively solved.