Aiming at the development trend of high-power semiconductor devices and multiple short laser diode array components integrated structure applied to a single all-fiber structure optical fiber lasers and lack of related heat control theory, the finite element software ANSYS is used to simulate the thermal properties of a high beam quality laser diode arrays based on the standard heat conduction heat sink structure. By changing the spacing and the number of light-emitting unit of the light-emitting elements in the array, the traditional structure of high fill factor cm-bar array is transitioned to short- or multi-unit integrated device thermal model. A theoretical basis is provided for the design and high-performance, long life heat of this new high beam quality device by its hot characteristics.