It is very difficulty to check the wounds of piles and it will take long time to repair it if the piled foundation was harmed or failed in earthquake. The hard work and the high cost for strengthening piles will also delay the reconstruction and even block its recover, that’s why many countries are paying more and more attention to seismic resistance reserves of piled foundation. Unfortunately this idea has not yet been completely accepted by our civil engineering so as to lead the bridge piled foundation weaker, the reserves of piled foundation is generally less than the piers. This paper analyzes and explaines the influence of the seismic resistance reserves of piled foundation on the safety of bridge by showing the principles, comparing the bar arrangement of typical piers and piles, and analyzing the sample bridges in China and Japan by non-liner pushover analysis.