For the disadvantages of the hybrid microcontroller application data capture, the serial acquisition storage structure is created by adopting external Analog to Digital(A/D) converter and the single chip microcomputer Serial Peripheral Interface(SPI) bus based on analyzing its mechanism and reason. The data capture rate is increased from 200 ksps to 780 ksps by using the clock source provided by single chip microcomputer. An overall scheme of the triaxial overload measurement is proposed based on this work. The results show that the capture rate can be increased to 2.5 Msps by improving the SPI bus clock rate, and it will serve as the future research direction.