The invention relates to a calculation method of neural synaptic plasticity based on calcium concentration, which relates to the field of brain simulation, in particular to the calculation problem ofneural synaptic plasticity of impulse neural network in brain simulation. The first is the calculation of calcium ion concentration. According to the membrane potential values of presynaptic neurons and postsynaptic neurons at the initial time t0 and the initial connecting weight w0 of synapses, the calcium ion concentrations in dendrites and spines at the next time t1 are calculated respectivelyfor the synapses that need to be calculated. Secondly, according to the calcium ion concentration in dendritic spine, the direction of weight change was obtained by comparing with the calcium ion concentration threshold Ca0s and Ca1s. According to the synaptic state tag Tag and the plasticity related protein PRP concentration, the change of synaptic weight was calculated, and the new weight at time t1 was obtained. the above procedure is repeated to calculate the strength of synaptic connections within the simulation time. The method of the invention is applied to constructing a brain-like neural network, completing the simulation of the learning and memory process required by the brain-like intelligence, realizing the universal strong artificial intelligence, and is applied to intelligentmedia, medical treatment and the like.