In this paper, the authors have implemented a blood flow simulator and a LDF(laser Doppler flowmeter) probe using self-mixing effect of the laser diode. The purpose of the blood flow simulator is to simulate microvascular blood flow in tissue. It consists of melinex film (thickness = 125 ㎛) which has similar optical characteristics to epidermis and porous polyethylene filter (Vyon, porosity 35%, mean pore size 50 ㎛, thickness=1 mm) which has similar optical characteristics to dermis. The blood flowmeter probe consists of laser diode(5 mW, 780 nm wavelength), CD lens(focal length 12 mm), current-to-voltage converter, highpass filter, and preamplifier. It doesn`t need optical fiber, therefore, implementation of the probe is simpler than conventional probe using optical fiber.