Background: RCC (viz. Renal cell carcinoma) takes up ninety percent of cancers of kidney. It consists of about three percent of the entire novel cases of adults. The kidney cancer is at the eighth place of the men's cancer frequently seen in Britain and the fourteenth of women's. VEGF (viz. vascular endothelial growth factor) refers to a critical pathway for angiogenesis of tumours and is important for the RCC progression, namely the renal cell carcinoma. Normal first-line VEGF-TT starts at either pazopanib or sunitinib. The data of trials in clinics found noninferiority of pazopanib in OS (namely, overall survival), in comparison with sunitinib being the priority treatment regarding mRCC (viz. metastatic renal cell carcinoma). A rationale for clinics and pharmacokinetics was alternative or non-classic. It dosed schedules integrating sunitinib. It encouraged to investigate of the results of the two drugs. Methods: The trials in clinics comparing the two drugs among the patients who had cancer of renal by 2019 were identified by a systematic review. The keywords including "sunitinib", "renal cancer" and "pazopanib" as well as corresponding combinations were searched in the databases, namely Cochrane, Web of Science, Pubmed, and EMBase. Regarding the first and second results collected from the included works, a systematic comparison was adopted as a network meta-analysis comparing the two drugs. Results: Eleven studies, consisting of 4784 patients, were involved in the present network meta-analysis. Significance was found between sunitinib and pazopanib regarding critical effectiveness and the outcomes of security. For example, there are toxicity-based dose reduction, overall survival, and proportions of the patients who undertook interventions regarding harmful events. The pazopanib had better effectiveness than sunitinib.