To start with, please read Einstein's book, "the Meaning of Relativity" very carefully. Second, read Zhou's papers [1,2]. Third, read my paper [3].

References
1. Zhou Pei-Yuan, “On Coordinates and Coordinate Transxxxxation in Einstein’s Theory of Gravitation” in Proc. of the Third Marcel Grossmann Meetings on Gen. Relativ. ed. Hu Ning, Sci. Press & North Holland. (1983), 1-20.
2. P. Y. Zhou (Chou), “Further Experiments to Test Einstein’s Theory of Gravitation” in Proc. of the International Symposium on Experimental Gravitational Physics, Guang Zhou, China August 1987.
3. C. Y. Lo, Misunderstandings Related to Einstein’s Principle of Equivalence, and Einstein’s Theoretical Errors on Measure-ments, Phys. Essays 18 (4), 547-560 (December, 2005).