The quantum effects of the general quantized mesoscopic RLC parallel circuit were studied based on the thermal field dynamics theory. The quantum fluctuations of the voltage and current in each branch which depended on the factors such as the elements of circuit, thermal vaccum state and time were analyzed. The results show that the quantum fluctuations in each brand are affected by all the three factors when the quantized mesoscopic circuit is in the thermal vaccum state. The fluctuations decay with time exponentially, but the decay rate have relation to the elements of the circuit only. The amplitude of the fluctuations at the initial moment is dependent on the elements of the circuit and temperature of the thermal vaccum state.