Abstract: BC4-1 multi-channels instantaneous signal acquiring apparatus was developed by our institute. In this paper, the apparatus has been introduced with its functions, technical targets. Operating modes and so on. During the process of developing this apparatus, we referenced the similar apparatuses in home and abroad, and also considered the characteristics of field measurements of geotechnical engineering, and therefore this apparatus has distinctive advantages, such as small volume, light weight, flexible power supply, simple and direct operating, and so on. We wish this apparatus will be admitted by the wide engineers and technicians.