A high gain, low noise, wide bandwidth and large input dynamic range transimpedance amplifier was designed and implemented by using 0.18μm BiCMOS technology. With a parasitic capacitance of 250fF, the main amplifying circuit, two-stage differential amplifier circuit and output buffer circuit structure were used to realize the good tradeoff between gain, bandwidth, noise and dynamic range. The testing results indicated that the single end transimpedance gain was 73dB, the -3dB bandwidth was 7.6GHz, the sensitivity was as low as -20.44dBm and power consumption was 74mW. The maximum differential output voltage was 200mV, the maximum input saturated photocurrent 1mA, the equivalent input noise was 17.1pA/Hz and the die size was as small as 800μm×950μm.