Objective To develop a functional assessment scale for pain in lower extremities and waist in island officers and soldiers, and to verify its reliability and validity. Methods Through fieldwork, interviews, discussions, literature and book reading, and expert meetings, a functional assessment scale for pain in lower extremities and waist in island officers and soldiers was developed, and then the scale was validated in an island unit. Reliability evaluation was carried out by internal consistency and retest reliability. Validity assessment was implemented by exploratory and validation factor analyses. Correlations between visual analogue scale (VAS), Oswestry disability index (ODI), self-rating anxiety scale (SAS), self-rating depression scale (SDS) and the various dimensions of the functional assessment scale for the pain were analyzed by Pearson linear correlation. Results A 4-dimension 20-item functional assessment scale for pain in lower extremities and waist in island officers and soldiers was successfully developed. The internal consistency Cronbach’s α coefficient was 0.927 and the retest reliability was 0.884; the cumulative variance contribution rate was 81.276%; the factor model fitted well (χ²/df＝2.106, goodness-of-fit index＝0.822, adjusted goodness-of-fit index＝0.766, root of mean square residual＝0.025, comparative fit index＝0.947, root mean square error of approximation＝0.088); the composite reliability of each dimension of the scale was greater than 0.7, the average variance extracted (AVE) was greater than 0.5, and the root value of AVE was greater than the correlation coefficient between each dimension. There were correlations between the pain severity dimension of the functional assessment scale for pain in lower extremities and waist in island officers and soldiers and VAS, between training readiness and daily life dimensions and ODI, and between psychological impact dimension and SAS and SDS (all P＜0.01). Conclusion The functional assessment scale for pain in lower extremities and waist in island officers and soldiers has excellent reliability and validity, and can be used to evaluate the pain in lower extremities and waist in island officers and soldiers.