The invention relates to a method for supplying lubricant to the sliding part of seamer or the best oil supplying report to the user, wherein it records the result data of real working state of seamer after last oil supplying period, to compare it with reference working condition; based on the serious degrees of said working time to correct the reference oil supplying time; then making the time of seaming operation from the last oil supplying time that over the corrected reference oil supplying time, as the oil supplying time.