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In this paper, we focus on subcarrier and power allocation for layered multicast streams in OFDMA cellular networks, where the multicast stream is composed of a basic layer and an enhancement layer. Our goal is to maximize the system total throughput with a total power constraint and a minimum rate requirement. A low-complexity allocation algorithm is proposed, which combined the suitability-based subcarrier allocation (SSA) with the traditional water filling (TWF) for the base layer and an advanced water filling (AWF) for the enhancement layer. Besides, we present a throughput-based user selection (TUS) algorithm which selects a proper set of users to serve when the minimum rate requirement can not be satisfied. Simulation results show that our proposed algorithm can improve the system throughput and outage probability.