The firing activities of a single ML neuron was explored according to the fast/slow dynamical analysis,and the synchronization of two coupled chaotic MorrisLecar(ML) neurons with chemical synaptic was investigated.It is shown that two coupled chaotic neurons with simple inhibition coupling can synchronize in phase when the coupling strength is larger than a certain critical value.When the conduction delay is considered,the two coupled neurons may achieve synchronization at a low coupling strength by an efficient time delay.But the time delay has the effect on synchronization and chaotic motion of coupled neurons only in certain coupling strength ranges.