Abstract: Based on macro-and meso-scales analysis on elastic, electric and thermal fields at a weak interface in piezoelectric composite laminates, four interfacial piezothermoelastic models (uncoupling, coupling and mixed) were built. According to these interfacial models, the piezothermoelastic coupling solutions of simply supported piezoelectric laminates with weak interfaces in cylindrical bending were obtained. Results show that the multi-fields coupling constitutive laws at a weak interface may be characterised in macro-and meso-scales, and some similarities among the interfaical models in different scales are observed. Under the thermal and force loads, the four models predict almost same elastic field, but similar distribution pattern of electric potential and temperature fields with different numerical results for the piezoelectric composite laminates. Under the electric loads, the differences of both elastic and elecric fields predicted by the four models are significant.