This paper deals with the follower-multileader set aggregation control of second-order continuous-timemulti-agent systems. In the investigation, it is assumed that the leaders are of the same velocity and cannot receiveinformation from each other, and two new neighbor-based control protocols are proposed to realize the local controlof multi-agent networks respectively without communication constraints and with communication delays. Then, byusing the frequency-domain analysis, the matrix theory and the Nyquist stability criterion, the sufficient conditionsfor the aggregation of all followers in a convex polygon region formed by multiple dynamic leaders are derived underthe two above-mentioned communication conditions. Finally, numerical simulations are carried out to verify theeffectiveness and feasibility of the proposed protocols.