Breccia has the characteristics of softening when exposed to water,which has a great impact on the bearing capacity of cast-in-place piles.Based on the static load test results of self-balanced method of two composite piles of steel pipe pile and cast-in-place pile in Phase I project of Yantian Port East,the bearing characteristics of composite pile of steel pipe pile and cast-in-place pile in breccia geology are studied.The results show that:1) The compressive shaft friction of cast-in-place pile in the strong weathered breccia and middle weathered breccia are not less than 150.06 and 248.67 kPa,respectively,and the pile-end resistance in middle weathered breccia is not less than 2,578.86 kPa.2) The pull-out resistance reduction coefficients of the strong weathered breccia and the middle weathered breccia are about 0.85 and 0.94,respectively.3) After the pile-soil relative displacement in the middle weathered breccia is greater than 0.50 mm,the growth rate of the shaft friction tend to stabilize,and the shaft friction of the pile is not fully activated before the pile-soil relative displacement is less than 3.68 mm.4) The theoretical calculation values of the vertical compressive ultimate bearing capacity of the test pile S1#?and S2#?are not less than 28,108.58 and 29,768.71 kN,with safety coefficients of not less than 1.34 and 1.42,respectively.The relevant results can provide reference for the pile length design of similar geological port terminals and other project.