There a lot of types of drill bit， used in geological exploration. In recent years PDC （Polycrystalline Diamond Compact） bits have been used widely and good technical and economical results obtained. However it is not enough well to design the bits and necessary to strengthen this work in order to get better results and wider application. In this field Russian drillers have made many works，obtained invention patents and got better results. Now the results are analyzed and researched， taking the three patents of them as researching objects， including cutting type double wing blade drill bit， stable drill bit， PDC spiral arrangement drill bit. The results may be have some reference value for us and should attract our attention.