To study the distribution of benefits between dominant and subordinate subadult crayfish(Procambarus clarkii) and their behavior responses to social context change- a larger intruding conspecific, we set shelter in the box where the dyad lived and 3 days later noted the occupied number, then introduced a single larger crayfish to the pair of crayfish with established social ranks and taped 30 min behavior of the three. We found that in shelter occupation, 71% of the shelters were occupied by dominant, 7% were by subordinate, 11% were occupied by both and the rest 11% were empty. In intruding and anti-intruding fight, male intruder showed no difference in attacks versus dominant and subordinate, while female mostly chose to begin the fight with the dominant; male dominant had no significant tendency between intruder and initial subordinate, while female prefer to interact with intruder; male subordinate had more aggressions to intruder than to initial dominant, while female subordinate showed few combat and no difference between with intruder and initial dominant. Thus, dominant provide increased access to resources, male and female have different strategy intruding and being intruded, crayfishes with different status show different behavior responses being intruded.