LTE(Long Term Evolution) network is developing at a very high speed all over the world. LTE voice solution is one of the key points in the LTE network and terminals. LTE network is totally based on the packet-switched architecture, which can not provide custumers with voice service in the circuit-switched network. We need to implement the IMS network to make the VoLTE work. However, it is impossible in the early days of the network implementation. This article introduces several voice solutions over LTE network, analyses good and bad aspects about each solution, and has a deep analysis about what solution should be implemented for operators in different periods.