Because of the high price of marketable charge amplifier, a low price charge amplifier was developed. It is based on the principal of the circuit of the charge amplifier. Simulation and experimental test show that this circuit is feasible. It has advantage of good transient stability,low price and anti-disturbance character,zero shift is less than 20mV.%由于市场上销售的电荷放大器价格昂贵，设计了一种低成本、小型电荷放大器。研究了电荷放大电路的原理，并依据原理设计了电荷放大器。通过仿真和实验测试了该放大器的可行性。实验证明，该电荷放大器动态稳定性好，抗干扰性强，零点漂移小于20 mV。
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