Parent-mediated intervention is a prominent approach to supplementing service insufficiency for the population with autism spectrum disorder, yet individuals from low-resource areas are largely under-represented among participants in the global parent-mediated intervention research. This systematic review and meta-analysis is the first to inspect the overall effects and research quality of parent-mediated interventions in mainland China, Hong Kong, and Taiwan. A total of 21 parent-mediated interventions were included in systematic review, and among them, 12 randomized controlled trials representing 964 children were analyzed in meta-synthesis. Overall, results of meta-analysis showed favorable effects of parent-mediated interventions with standardized mean difference ranging from 0.63 (social competence) to 1.00 (symptom severity) and averaged 0.76 across domains. However, the results should be interpreted with caution due to poor evidence quality as assessed in GRADE ratings. In terms of methodological quality, QualSyst evaluation showed that more than half (14/21) of the included studies were below satisfactory. Identified programs lack the capacity to be further disseminated in the Chinese societies due to the absence of solid theoretical foundations, the negligence of implementation outcomes, and the inadequacy of sophisticated cultural adaptations. This review reinforces the need for promotion and improvement of parent-mediated interventions in low-resource context (PROSPERO: CRD42019138723).