Abstract: Through the tensile test and the cupping test of low carbon cold rolled steel sheet SPCC-SD and ST14. It is analyzeed in this paper the results of the two above tests,and also illustrateed in this paper the characteristics and the applications of the two above tests respectively from three aspects i.e. the preparatory of the samples,the parameters of the tests and the applications of the testing results.With regard to the low carbon cold rolled steel sheet thinner than 1mm,the cupping test is more suitable for evaluating the plasticity and the ductibility of the above mentioned steel sheet than tensile test.