Three kinds of interactions between the twins and the anti phase boundaries(APBs) have been studied in massive transformation for Ti 47Al 2Nb 1Mn alloys. The results show that: the twins are usually thicker when the twins intersect with the APBs or the APBs are terminated with the twins; and the twins usually thinner when the twins are terminated with the APBs on the ends.In the late case, the twin has a wedge shape and ended at the APB with a sharp tip. Thus, we can conclude that in the course of the massive transformation there must be some close relations between the twins and the APBs which lead to the three kinds of interactions mentioned above.