Abstract: The paper presents theoretical closed-solution to flexural deformation based on the moment-area method. The moment-curvature curve and load-deflection curve are calculated, and the feasibility of the theoretical closed-solution is further evaluated through a comparison between the results obtained by the simplified equation and the experimental measurements from four-point bending tests on specimens made of ultrahigh toughness cementitious composite. The comparison analysis shows that the results obtained based on closed-solution agree well with the test data with the maximum error of 5%, whereas the result by the simplified equation has significant errors, as high as 30%-50%. The analysis also shows that there is no influence of depth on the calculated deflection based on closed-solution. Therefore, for the tension strain hardening material, the closed solution to flexural deformation is more reasonable and can be regarded as a prediction approach for the inverse evaluation of tension property.