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The detection of the magnetic type B-mode polarization is the main goal of future cosmic microwave background(CMB)experiments.In the standard model,the B-mode map is a strongly non-gaussian field due to the the cosmic weak lensing effect component.Besides the two-point correlation function,the other statistics are also very important to dig the information of the polarization map.In this poster,the Minkowski functionals(MFs)are employed to study the morphological properties of the lensed Bmode maps by comparing the results with Gaussian map.Additionally,in order to investigate the leakage from E-mode to B-mode,we set up both real case and ideal case to compare.