Abstract: A time and frequency transfer experiment based on the precise point positioning(PPP)technique was carried out using IGS 5 min and 30 s interval precise satellite clock products.The results demonstrate that the precision of time transfer based on PPP technique is up to 0.1~0.2 nanosecond and a frequency stability of 1×10-15~2×10-15is derived for averaging times of half-day,whether using IGS 5 min or 30 s interval precise satellite clock products.The results also indicate that whereas by using 30 s interval precise satellite clock products we could get a clearly improved frequency stability over that derived by using a 5 min interval precise satellite clock products in the short term.There is no significant improvement in the long term.