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Channel numbers and measurement accuracy of analog acquisition systems are increasingly demanded in modern satellite drive and control systems. However, existing technology lacks systematic research on the acquisition accuracy of the system. As a result, acquisition accuracy often fails to meet expectation in the substitution process of domestic key components. To solve this problem, factors affecting the accuracy of the multi-channel analog acquisition system, which is based on multi-channel analog switch and switched capacitor analog-to-digital converter (ADC), are studied systematically. The analysis models of the static and dynamic error of the system are respectively build, and theoretical basis for key components selection is established, which are verified by a 128-channel analog acquisition system based on the domestic 16-channel analog switch and 8-channel 12-bit switched capacitor ADC. The results show that the absolute measurement accuracy of the system is better than 1.6 mV, which is better than the estimated error of 1.883 mV introduced by the ADC itself; and it indicates that the established criteria for key components selection based on the static and dynamic error models has general guiding significance for designing and improving the measurement accuracy of multi-channel analog acquisition systems.