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The pier top displacement caused by temperature difference is an important index in the design. In order to fill the vacancy of applicable calculation formula for pier top temperature difference displacement in the current 2017 bridge code, the requirement of 0. 5 times displacement of temperature difference should be taken into account in the code to check pier top displacement. Based on the mechanical balance and geometric relationship, the pier top displacement calculation formulas in both linear and nonlinear temperature fields are deduced respectively through strict theoretical derivation. The equivalent linear temperature could be taken as 5 °C by displacement equivalence, and the equivalent linear temperature difference formula is used to check the general chart. The research results show that: (1) The calculation formula of pier top displacement of solid pier temperature difference derived theoretically can make up for the vacancy of calculation formula of 2017 bridge code; (2) Through the equivalent analysis of linear temperature field and nonlinear temperature field, the equivalent linear temperature difference is 5°C, which is consistent with the German Code; (3) For the pier with known temperature field, the calculation formula of nonlinear temperature field could be used, while for the pier without temperature field, the calculation formula of equivalent linear temperature field could be applied in design; (4) The check results of the solid pier general chart show that the displacement of pier top increases with the increase of pier height, and the horizontal displacement contributed by temperature difference could reach about 12% of the allowable bending angle. [ABSTRACT FROM AUTHOR]