************************************************************************* 51254 In the region between ABELL399 and ABELL 401, the excees emission of the hot gas was found with ASCA. This will be the first evidence of interaction among clusters of galaxy. In order to study the super cluster in more detail, we propose to observe the link region between ABELL3391 and ABELL3395 with ASCA. The system of A3395 and A3391 has similar a scale to the system of A399 and A401, and the link region has the group galaxy with extraordinary large velocity dispergion, so there is a great possibility of interaction among the galaxy clusters. *************************************************************************