Abstract: The effect of grain number in the thickness direction of the specimens of 800H alloy and 316L stainless steel on the repeatability of the load-displacement curves was studied by small punch tests and crystal plasticity finite element simulation. By using the results of the small punch test, the tensile strength of 0.1 mm thick 316L stainless steel ultra-thin sheets with an average grain size of about 10 μm was obtained by a database method, and was compared with the tensile test results. The results show that for ultra-thin sheets with random grain orientation, when the number of grains in the thickness direction exceeded 3, the load-displacement curves of the specimens had good repeatability, and their mechanical response was not affected by the randomness of grain orientation. As the number of grains in the thickness direction increased, the shear strain distribution of the specimens became more uniform. The tensile strength of 0.1 mm thick 316L stainless steel plate was 630.0 MPa by the database method, The error relative to the tensile test result （641.4 MPa） was only 1.77%, verifying the reliability of the database method.