This study investigated convergent validity of the bookmark standard setting method used for English reading and listening ability. The data set was obtained from 2005 Taiwan Assessment of Student Achievement (TASA) data bank. A total of 10101 sixth graders from different areas of Taiwan were cluster sampled and tested by a 40-item scale. The scale was developed through balanced incomplete block design out of 70 items. Thirteen experts formed bookmark standard setting seminar. Among them, 7 were university professors in the English-as-a-Foreign-Language (EFL) field, 3 were professors in measurement, and 3 were elementary school English master teachers.  They attained the consensus of cut score Ө=-.57 with 72.7% of students were classified as passed. The result from normal mixture model (Ө=-.40) was consistent  with the result from the bookmark standard setting method with classification consistency Kappa=.87, indicating convergent validity evidence. In line with this finding, issues on how to implement bookmark standard setting approach were further explored and discussed.