Aiming at the problem that PHC pile fabricated by Chinese standard should be expressed by British Standard in Southeast Asia，based on general rules on a concrete structure in British standard，mechanical property calculation method of PHC pile in British standard is founded. The mechanical properties include material strength，prestress loss，axial allowable maximum working force，shear capacity，cracking bending moment，and ultimate bending moment，and these items are compared with the corresponding resuls in Chinese standards. The comparison shows that the British standard result is close in total prestress loss and effective stress in concrete，smaller in the allowable maximum working force，and larger in shear capacity，cracking bending moment，and ultimate bending moment. The result has provided reference to the application of PHC pile standards in the overseas areas.