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Four new daphnane-type diterpenes named tianchaterpenes C-F (<b>1</b>–<b>4</b>) and six known ones were isolated from <i>Stelleropsis tianschanica</i>. Their structures were elucidated based on chemical and spectral analyses. The comparisons of calculated and experimental electronic circular dichroism (ECD) methods were used to determine the absolute configurations of new compounds. Additionally, compounds <b>1</b>–<b>10</b> were evaluated for their cytotoxic activities against HGC-27 cell lines; the results demonstrate that compound <b>2</b> had strong cytotoxic activities with IC₅₀ values of 8.8 µM, for which activity was better than that of cisplatin (13.2 ± 0.67 µM).