In this investigation, a numerical method based on potential flow for aerodynamic analysis of BWB aircrafts has been developed. At first, results of this method are validated with experimental data and then, three current BWB planforms have been chosen and analyzed to determine suitable planform for BWB aircrafts. The results show that aerodynamic characteristics of (A) and (B) planforms are better than (C) planform. On the other hand, the (A) planform has better a uniform lift distribution along the span, less induced drag, more space and less noise than (B) planform. Finally, the (A) planform is a suitable configuration for BWB aircrafts.