Abstract: The research on bit type selection with logging data was developed. This paper set up the relational model of interval transit time and rock drillability of formation rock by laboratory experiment and field document. Using the model in association with seisrnic,geology, logging and drilling data of Bachu area,of Ta Xinan in Xinijiang, proper bit type se lection was made and initial results were obtained in this area. It was first applied in wellsite with good results. To select bit using logging data is a new technique.