Photoperiod is an important factor to the inducing plants flowering. This paper presents the analysis in the photoperiodic reaction types approaches of plant flowering. It is pointed out that the photoperiod plays an concrete role in application of plant flowering. Meanwhile, other environment factors are needed to be considered. In order to make the effective development in agricultural planting flowers industry come true, this paper provides a beneficial idea. Moreover, this idea also has a scientific basis for LED manufacturers when producing plant growth lighting.