As the key element of the gyrostats,the single crystal fiber has a wide application in the fields of aerospace,electricity and casting.For the upper limit of the tested temperature is continuously increasing（＞2000 ℃）,a optical system for preparing zirconia crystal optical fiber based on LHPG is proposed,which can prepare the zirconia crystal optical fiber to measure the higher temperature.The basic structure and characteristics of the system are introduced and the parameters of the system are analyzed.The system has been simulated through the ZEMAX optical software.The results show that the system meets the design requirements and it has the advantages of good symmetry,high efficiency,nice uniformity of energy distribution.This provides theoretical basis for the preparation of high temperature zirconium oxide single crystal optical fiber.