Inertial fusion energy (IFE) is a well-known safe, carbon-free, sustainable and clean energy source. An overview of conceptual design of diode-pumped solid-state laser driver for laser inertial fusion energy (LIFE) project is presented while some emphases are given on laser system requirements, laser architecture and some key technical units. Among those, the laser architecture consisting of optical layout, amplifier architecture, gain medium and system efficiency, and diode laser pump source are introduced in detail. Key technical units, such as thermal birefringence and depolarization compensation, cylindrical spatial filter concept, are also summarized. The development of LIFE project has an important effect on high average power laser technology, high power diode and laser material.