The limitations to shot noise measurement methods based on superconducting quantum interference device (SQUID) and superconductivity-insulation-superconductor (SIS) Josephson junction are pointed out, and a method to measure the shot noises of conventional electronic devices is proposed. Shot noise characteristics of conventional electronic devices are analyzed, and then a low-temperature measurement system is established. By using a double-shielding construction and low noise preamplifier, the test system can achieve a good electromagnetic interference shielding and low background noise. The theoretical and the experimental results of shot noises in diodes at 10 K are in good agreement with each other. The accuracy and the credibility of measurement system are proved.