: In this study, a micromechanical model is proposed to take into account the effects of nanotube waviness, agglomeration on mechanical properties of polymer nanocomposites. The micromechanical model presented in this study is applicable to different nanocomposites, composites containing reinforcement materials and different matrices. It is shown that the unsatisfactory improvement in the mechanical properties of CNT-reinforced composites could be attributed to the weak bonding between CNTs and polymer matrices as well as the waviness and agglomeration effects of CNTs. In the first section of this work, the effects of CNT waviness and aggregation on the overall properties of the CNT reinforced shape memory nanocomposite are simultaneously examined. Then, a new micromechanical model is proposed to consider the debonding effects of reinforcements from the matrix. This model is valid for the ductile matrix as metal and polymer. To validate the predictions of the proposed model, the results are compared to those obtained from the experimental results. Moreover, it is shown that the proposed model and the experimental results as well as the FE simulation for the concept of debonding which was performed in this study are in good agreement. Keywords Nanocomposite, Micromechanical model, Carbon nanotube, Debonding, Waviness, Shape memory polymer.