LncRNAs play a pivotal role in tumorigenesis and development. However, the potential involvement of lncRNAs in colon adenocarcinoma (COAD) needs to be further explored. All the data used in this study were obtained from The Cancer Genome Atlas database, and all analyses were conducted using R software. Basing on the seven prognosis-related lncRNAs finally selected, we developed a prognosis-predicting model with powerful effectiveness (training cohort, 1 year: AUC = 0.70, 95% Cl = 0.57-0.78; 3 years: AUC = 0.71, 95% Cl = 0.6-0.8; 5 years: AUC = 0.76, 95% Cl = 0.66-0.87; validation cohort, 1 year: AUC = 0.70, 95% Cl = 0.58-0.8; 3 years: AUC = 0.73, 95% Cl = 0.63-0.82; 5 years: AUC = 0.68, 95% Cl = 0.5-0.85). The VEGF and Notch pathway were analyzed through GSEA analysis, and low immune and stromal scores were found in high-risk patients (immune score, cor = - 0.15, P < 0.001; stromal score, cor = - 0.18, P < 0.001) , which may partially explain the poor prognosis of patients in the high-risk group. We screened lncRNAs that are significantly associated with the survival of patients with COAD and possibly participate in autophagy regulation. This study may provide direction for future research.