Combined with the single pile horizontal static load test in Shanghai and the data of the bending moment of pile, research the bearing capacity of PHC pile under the action of horizontal load. According to the test data, determining the level of ultimate bearing capacity of foundation soil, the horizontal resistance coefficient ratio were analyzed, and the measured results and the current specification using "m" method the calculated results were compared with those obtained from analysis, some conclusions for the future Shanghai area of horizontal bearing capacity of single pile design and theoretical research to provide reference.