The utilization of creative design methodologies plays a pivotal role in nurturing innovation within the contemporary competitive market landscape. Although Theory of Inventive Problem Solving (TRIZ) has been recognized as a potent methodology for engendering innovative concepts, its intricate nature and time-consuming learning and application processes pose significant challenges. Furthermore, TRIZ has faced criticism for its limitations in processing design problems and facilitating designers in knowledge acquisition. Conversely, Environment-Based Design (EBD), a question-driven design methodology, provides robust methods and approaches for formulating design problems and identifying design conflicts. Large Language Models (LLMs) have also demonstrated the ability to streamline the design process and enhance design productivity. This study aims to propose an iteration of TRIZ integrated by EBD and supported by an LLM. This LLM-based conceptual design model assists designers through the conceptual design process. It begins by using question-asking and answering methods from EBD to gather relevant information. It then follows the EBD methodology to formulate the information into an interaction-dependence network, leading to the identification of functions and conflicts required by TRIZ. Lastly, TRIZ is used to generate inventive solutions. An evaluation is carried out to measure the effectiveness of the integrated approach. The results indicate that this approach successfully generates questions, processes designers’ responses, produces functional analysis elements, and generates ideas to resolve contradictions.