ObjectiveTo evaluate whether intergroup differences in the risk of maternal pregnancy complications following in vitro fertilization (IVF) vary with male factor. DesignA post hoc exploratory secondary analysis of data from a multicenter, randomized, controlled, non-inferiority trial (NCT03118141). SettingAcademic fertility centers. SubjectsA total of 1131 subfertile women with complete recording of their male partner's semen parameters during the trial were enrolled. All participants underwent intracytoplasmic sperm injection (ICSI) followed by frozen embryo transfer (FET) as part of their assisted reproductive technology (ART) treatment protocol. InterventionsWomen were divided into an oligoasthenospermia group (n=405) and a normospermia group (n=726) according to the quality of male sperm. Main Outcome MeasuresPregnancy complications, principally including the incidence of preeclampsia. ResultsNotably, we found that the risk of maternal preeclampsia was significantly higher in the oligoasthenospermia group than in the normospermia group (P=0.035). After adjustments for confounding factors by multivariate logistic regression analysis, the incidence of preeclampsia in the oligoasthenospermia group was still significantly higher than that in the normospermia group (6.55% vs. 3.60%; OR=0.529; 95% CI=0.282-0.992; P-adj=0.047). However, there were no significant differences in terms of embryo quality, cumulative live birth rate, other pregnancy complications or neonatal outcomes between the two groups (P>0.05). ConclusionOligoasthenospermia was associated with a higher risk of maternal preeclampsia in subfertile couples undergoing IVF-ET treatment. In clinical practice, it is essential to thoroughly evaluate the sperm quality and quantity of male partners before IVF-ET. Further research is needed to establish the causal relationships between semen quality and adverse pregnancy complications, particularly preeclampsia, and to explore potential interventions.