Background: The standard first-line therapy followed by maintenance treatment is an optional approach to balance the efficacy and toxicity for metastatic colorectal cancer (mCRC). In general, this approach had been seen PFS benefit in some trials, but probably lack of OS benefit, which indicating that new regimens needed to be explored. Anlotinib, a novel multi-targeted TKI, significantly prolonged the PFS of refractory mCRC in a phase III clinical trial (NCT02332499). Previous results of this study exhibited antitumor efficacy and manageable toxicity for mCRC. Here we report an update results with a longer follow up. Methods: 29 patients with unresectable mCRC, aged 18-75, without prior systemic treatment and ECOG performance status 0-1 would be prospectively included. Anlotinib 10mg and capecitabine 1000mg/m² was given orally for 14 days in 3-week cycles; oxaliplatin 130mg/m² was given by intravenous infusion on day 1 in 3-week cycles. After 6 cycles of induction therapy, patients would receive anlotinib (12mg, po, d1~14, q3w) until disease progression or intolerable adverse events. The primary endpoint was PFS. Secondary endpoints included ORR, DCR, DOR and safety. Results: At data cut-off date (June 30, 2022), a total of 31 patients were enrolled, the median age was 57 years, 23 (74%) were males, ECOG PS 0/1 was 18 (58%)/13 (42%), 28 (90%) had more than one metastatic tumor. Among them, 24 patients were available for efficacy assessment. The median PFS was 8.28 months (95% CI: 6.29-10.27) and the median DOR was 6.01 months (95% CI: 4.59-7.43). The ORR was 62.5% (95% CI: 40.6-81.2) and DCR was 91.7% (95% CI: 73.0-99.0) in best overall response assessment, of which the longest duration of treatment was 17.5 months. The treatment-related adverse events (TRAEs) occurred in 31 pts (100.0%) including nausea (58.1%), vomiting (51.6%), neutropenia (51.6%), leukopenia (35.5%), hypertension (35.5%). The Grade 3/4 TRAEs were neutropenia (12.9%), hypertension (12.9%), lipase elevated (9.7%), hypertriglyceridemia (6.5%), and leukopenia (3.2%). Conclusions: The updated results suggested that anlotinib combined with XELOX as first line regimen followed by anlotinib monotherapy as maintenance therapy showed a promising clinical benefit and favorable safety profile for mCRC, and the results needed to be confirmed in trials continued subsequently. Clinical trial information: ChiCTR1900028417.