The simulation and analysis of beam forming about broadband parametric array with rectangle transduction array and loop transduction array have been completed in this paper.The results show that under the condition of the same array element numbers with N=9 and same array size with rm=49 mm,the -3 dB beam width of rectangle array is about 6.3°(comparing to 7.4° of loop array),and its side lobe amplitude is inhibited completely (comparing to the value of 10% about loop array).It means that the rectangle array is more effective at beam directivity improving and side lobe amplitude inhibition.The method of element signal time delay is used to parametric array signals beam steering implement.As a result of Beam steering, the beam main lobe turned to width more,its peak value of amplitude reduces obviously,and it doesn’t point to the direction which is planned to.The reasons of these problems are discussed in this paper. It is verified that these problems could be corrected by increasing array elements and spreading array size.