This paper presents SEAL, a hybrid resource distribution algorithm for data centers. SEAL is designed based on two well-known algorithms: the Best-Fit algorithm and the Next-Fit algorithm. With a dynamic hybrid mechanism, SEAL guarantees good performance in four important aspects simultaneously: Scalability, Efficiency, Agility and Low-Fragment. Experimental results show that the efficiency of the SEAL algorithm is almost as good as the Best-Fit algorithm, while keeping faster querying speed (about two to four times of the Best-Fit algorithm).