In order to research the stacking sequence design method of resin based composite material horizontal tail in VARI molding process and obtain the optimal laminate scheme, a numerical model for strength analysis of composite material horizontal tail was established, and a preliminary plan for layering of horizontal tail was obtained. We designed and manufactured test pieces and test fixtures for the horizontal tail wing, and applied critical loads according to the requirements of article 23.423 of CCAR—23 for maneuvering loads to complete the test verification. The measured values of the test are in good agreement with the calculated values at the corresponding positions, indicating that the established numerical model is effective. Based on the displacement and stress-strain results, the optimization design of the paving sequence for the spar cap was carried out. The optimization results show that, under the same proportion of paving layers at different angles, the paving sequence had little effect on the overall stress distribution of all paving layers of the edge strip, but had an impact on the maximum stress value. The optimal plan of 3 layers and 1 group of laminating layers obtained through the sequence optimization research can be used for the paving design of the horizontal tail spar cap.