To develop a weak-light detector that meets the needs of space gravitational wave detection in the future, the performance detection of weak-light detectors was initially carried out, and the performance parameters, such as responsiveness, response bandwidth and background noise, of the detectors were analyzed, for finding out the method and solution of weak-light detector development that can meet the requirements of future space gravitational wave detection. Firstly, according to the design scheme of the space gravitational wave detection, e.g. Taiji, including laser power, orbit design and star spacing, the parameters of the detector required by Taiji were calculated. Next, three kinds of weak-light detectors were developed by the China Electronics Technology Group Corporation No.44 Research Institute, Southwest Institute of Technical Physics, Shanghai Institute of Technical Physics of the Chinese Academy of Sciences with joint efforts of our research group. Finally, the responsivity, response bandwidth, and background noise of the detectors were tested by the low-noise heterodyne laser interferometry system developed by our research group, and the factors affecting the performance of the detectors were analyzed. The experimental results show that the responsiveness of two detectors is better than 1.8×105 V/W and that the response bandwidth is greater than 10 MHz. The ground noise of the three detectors is lower than 10 pm/Hz@10 mHz (0.1 mHz-1 Hz), and the signal-to-noise ratio is higher than 20 dB. According to the aforementioned experimental results, the three detectors have the potential to meet the requirements of the Taiji Pathfinder in terms of responsiveness, response bandwidth, and signal-to-noise ratio.