Abstract: In highway bridge engineerings，the bearing characteristic of PHC pipe pile under the action of horizontal load is very important． However，little research was done in the main influence factors and the pile group effect． First，the bearing characteristics and the main influence factors of PHC pipe pile by horizontal load were analyzed，which were also compared with those of square pile and round pile． Then，the group piles effects of PHC pipe piles were studied and compared with the ones of different types of piles under the action of horizontal load． The results showed that the PHC pile had strong anti-horizontal displacement property，large section modulus and the effect coefficient of pile group．