In piling works, both the type of the piling hammer and the driven ability of the pile are related to the penetration. Thus the penetration controlling shall be studied. Taking the Piers, Wharves & Ancillary Work at Changi East-Phase 4, Singapore as an example, we study the penetration calculations and controlling methods for pile driving and the discuss the verification and improvement measures. The analyzing result shows that the penetration calculation in piling construction provides a direct and effective method for reasonable selection of driving hammer and control of penetration both at home and abroad.