The present invention provides a method for constructing a universal LED bulb (102), a snap ring lens type LED bulb (102) and a lamp. The constructing method includes: supporting an optical engine core member of the LED bulb using a lens snap ring (8) as the supporting main body, using a light distribution optical lens (7) as an auxiliary supporting structure, and further using the light distribution optical lens (7) as an installation base of the optical engine core member, or using the light distribution optical lens (7) as an installation base of an LED bulb radiator (103) in cooperation with an inner snap ring (81), wherein an installation flange is provided to the lens snap ring (8) for installing the LED bulb (102). The LED bulb (102) may be provided with the radiator (103) to independently work and may also be installed on the radiator (103) of the lamp.