By the improvement on the traditional CPT data acquisition system, the paper introduced the collection of CPT pressure data using data acquisition card. The ground data acquisition instrument is used to collect the range data and the process of data collection is carried out with clock information to match in time sequence and data. The data can be stored with the data storage module and also can be displayed through the liquid crystal display module after the serial transmission. After integrated processing, the data were put into the host computer management system and the final data curve of CPT can be displayed. There are many characteristics in the whole process, such as wire-less, high precision of acquisition, high integration, large storage and being economic and convenient. The improved CPT data acquisition system is verified applicability through field experiments at last.