Disclosed is a photo-stimulation method employing an agonist agent, and a kit for introducing same. The method includes the following steps: providing a light-emitting diode (LED) illuminant which is a yellow, red, green, blue LED or a mixture of two or more kinds thereof, and an agonist agent which contains 0.5% to 2% calcium ion; and adding the agonist agent to a subject and illuminating the subject by the LED illuminant to promote collagen synthesis, to suppress microbial growth, or to inhibit melanin synthesis, wherein the yellow LED is in an illuminance range from 1,000 to 3,500 lux, the red LED is in an illuminance range from 6,000 to 9,500 lux, the green LED is in an illuminance range from 1000 to 5000 lux, and the blue LED is in an illuminance range from 3,000 to 7,000 lux.