This study, from a dynamic motivational perspective, examines the development of motivational strategies in L2 vocabulary learning and its relationship with vocabulary knowledge. It conducts a survey among 281 non-English major freshmen and sophomores with the questionnaire and vocabulary test( Tseng & Schmitt 2008) , and analyzes the data collected through structural equation modeling. The findings are as follows : ( 1 ) the motivational strategies employed by the subjects in pre-action, action and post-action of vocabulary learning play...