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In this paper, we investigate the offline packets scheduling of a downlink system with two heterogeneous latency-constrained users. Specifically, user 1 is a latency-tolerant user which has one packet with long latency requirement, while user 2 is latency-sensitive user which has multiple packets with short latency requirements. To precisely characterize the transmission latency, the finite blocklength codes (FBC) capacity formula is used to measure the achievable date rates of the users. To cope with the heterogeneous latency requirements of users, a hybrid NOMA scheme is proposed. In the hybrid NOMA scheme, the packets of user 2 are non-orthogonally delivered with the packet of user 1 in a sequential way by taking the packets arrivals and deadlines into consideration. Due to complicate FBC capacity formula and the coupling effects of the variables, the formulated transmission energy minimization problem is …