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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). The ideal dosage for early intensive interventions for autism spectrum disorder has been suggested to be at least 25-hour per week to reach optimal effects. However, insufficient service use and unmet needs among families with children with autism spectrum disorder are frequently reported worldwide. Helping parents to develop strategies for interaction and management of behavior through parent training has been demonstrated to be a prominent way to supplementing service insufficiency for autism spectrum disorder, which is particularly crucial in less-resourced areas. This review included 21 parent-mediated intervention programs conducted in China, the most populated developing country. Among them, we were able to combine outcome information from 12 randomized controlled trials to increase confidence in the results. We also rated the quality of methodology and evidence for all included studies, which was taken into account in making conclusions. The included programs varied in the content, length, and delivery method of trainings. Although targeting different training outcomes, the majority of the studies aimed to help parents be more competent and responsive during interactions with their child in order to decrease symptom severity. Overall, results showed sufficient evidence that parent training did improve child outcomes as intended. However, the quality of more than half (14/21) of the included studies were below satisfactory. Identified programs lack the capacity to be further transported in the Chinese societies due to the lack of solid theoretical foundations, implementation manuals, and appropriate cultural adaptations. This review reinforces the need for promotion and improvement of parent-mediated interventions in low-resource context. [ABSTRACT FROM AUTHOR]