Taking 6 genetic populations〔P₁，P₂，F₁，F₂，B₁ （125×F₁），B₂ （126×F₁）〕constructed
by crossing eggplant inbred line 125 and 126 as test material，this paper conducted conjoint analysis of multigenerations
on eggplant plant height trait using major gene and polygene mixed inheritance model．The results
showed that there were significant genetic differences in plant height of tested parent，and the plant height traits
value of segregative generations all showed unimodal partial normal distribution，belonging to quantitative
inheritance．The results also showed that the most suitable genetic model for plant height trait was C-0 genetic
model．There was no major gene genetic effect existed，showing a genetic model controled by polygene with
additive-dominance-epitasis．The polygene genetic effects of plant height was further analyzed according to
the second order genetic parameters．The results showed that the polygene heritability in F₂ and B₂ eggplant
segregative generations were 49.24% and 22.77%，respectively．The plant height of eggplant gave priority
polygene inheritance．