Abstract: Lean startup is an important route to facilitate rapid growth of new ventures, and it is a new topic with great value for both theory and practice. However, how new ventures implement lean startup, and how lean startup guides new ventures to get rid of resource constraints remain unexplored in extant researches. According to effectuation theory and individual motivation theory, we construct a model of lean startup, entrepreneurial bricolage, entrepreneur feedback seeking and entrepreneurial passion. Through an empirical study of 204 entrepreneurs, this paper arrives at the main findings as follows: firstly, lean startup has a significant positive impact on entrepreneurial bricolage; secondly, entrepreneur feedback seeking has a mediating role in the relationship between lean startup and entrepreneurial bricolage; thirdly, entrepreneurial passion positively moderates the relationship between lean startup and entrepreneur feedback seeking.