Abstract In this research, our main purpose is to attempt to promote the speaking strategies of prep students focusing basically on lexical chunks, personalizing communicative competence and amusing feature motivation by improvisation. Teaching vocabulary within a contextualized situation is highly influential compared to current approaches, and integrating post-speaking activities with an acting is opted for more frequently, as learners are required to use implicitly acquired structures in another productive skill, with the philosophy language as a means. This study was conducted to look into the effects of improvisation on the speaking strategies and lexical competence of preparatory students in School of foreign languages at Istanbul ſehir University. It was designed as a both qualitative and quantitative method. The data was collected through the content analysis by means of rubrics. With the help of those instruments, the effectiveness of improvisation so as to promote speaking strategies and lexical competence of students in pre-intermediate level was tested. The other aim of the study is to find out if students vocabulary knowledge could be improved through improvisation and the last aim is to find out students attitudes towards improvisation in terms of lexical items. In the light of the data analysis, the result and the analysis of the vocabulary and speaking rubrics revealed that participants succeeded in promoting their speaking strategies and lexical competence. Study result has revealed that students had positive impact toward vocabulary learning in the speaking process. Data results have also shown that, learners were actively participants.