The rapid growth of IP traffic has contributed to wide deployment of optical devices in elastic optical network. However, the passband shape of wavelength selec-tive switches (WSSs) that are used in reconfigurable optical add - drop multiplexer (ROADM)/optical cross connect (OXC) is not ideal, causing the narrowing of spectrum. Spectral narrowing will lead to signal impairment. Therefore, guard-bands need to be inserted between adjacent paths which will cause the waste of resources. In this paper, we propose a service - based intelligent aggregation node selection and area division (ANS-AD) algorithm. For the rationality of the aggregation node selection, the ANS-AD algorithm chooses the aggregation nodes according to historical traffic information based on big data analysis. Then the ANS-AD algorithm divides the topology into areas according to the result of the aggregation node selection. Based on the ANS-AD algo-rithm, we propose a time-domain and spectral-domain flow aggregation (TS-FA) algo-rithm. For the purpose of reducing resources’waste, the TS-FA algorithm attempts to reduce the insertion of guard-bands by time-domain and spectral-domain flow aggrega-tion. Moreover, we design a time-domain and spectral-domain flow aggregation module on software defined optical network (SDON) architecture. Finally, a simulation is de-signed to evaluate the performance of the proposed algorithms and the results show that our proposed algorithms can effectively reduce the resource waste.