Abstract：The test method of the flattened Brazilian disc specimen is reviewed more comprehensively. This method can be used to determine three mechanical parameters，that is，elastic modulus，tensile strength and fracture toughness，in one test simultaneously. The loading manner of the test machine and the contact condition between the machine plate and flatten surface of the specimen can affect the test results. Such effect is taken into consideration and appropriate adjustment of the coefficient in the formulas is made for calculating the three parameters. The actual loading manner and contact situation in laboratory test may not be known exactly，in other words，the test condition is not in exact conformity with that for the numerical analysis. This setback should not frustrate our efforts to approach nearer to the reality in the analysis. In this paper，four extreme loading conditions are chosen for the renewed finite element analysis：(1) uniform pressure loading and zero shear stress，(2) uniform pressure loading and zero lateral displacement，(3) uniform normal displacement loading and zero shear stress and (4) uniform normal displacement loading and zero lateral displacement. They are applied to the finite element program as input boundary condition，respectively. Definitely more detailed results are obtained. However，it is considered that a suitable average value for the extreme values of the coefficient is more appropriate，so that the average values are given to update the formulas. Finally，an independent test record done by our collaborators in Sweden is given to show the applicability of the proposed test method.
