LAM(Laser assisted machining) is machining method that performs a machining for work pieces using a laser preheating process. By combining the LAM and CNC lathe using laser beam, it could be named LAT (Laser Assisted Turning). A machining process in LAT has been applied at $1200{sim}1400^{circ}C$ using a specific cutting tool, after preheating a workpiece using laser beam as about $2000^{circ}C$. This study performed a review on the laser assisted turning and heat treatment through classifying these technologies into three categories; the device and mechanism for establishing LAT, the machining process and heat treatment for applying LAT, and the analysis and theoretical research, which are the most important issues in LAT.