From experiment results of pressing piles having drilling and some methods of calculating the bearing capacity of piles, resistance factors mr are computed. The value of resistance coefficient for one type of soil is different from that for the others. However, the resistance factors of piles in Vietnamese Design Standards of Civil Engineering (TCXDVN 205:1998) have not shown this diference. This paper presents the resistance factors for some typical types of soil of geological condition in Binh Dinh province. Thereby, the authors have additional knowledge to calculate designs for more sensible results.