During the fabrication of polymer products, the inevitable processing procedure such as extrusion, injection, has a dramatic impact on final morphology and properties. Different from the spherulitic morphology, when polymers undergo an external field, nucleation as well as crystal growth is enhanced. The morphology alters to the well-known ‘shish-kebabs’. Numerous studies concerning about flow-induced polymer crystallization have been performed since the 1960s. However, the nature of flow-induced crystallization still is not a well-understood fundamental problem due to its nonequilibrium property. In this study, the kinetic pathway in the very early stage of flow-induced crystallization was investigated in a polymer “solution” with a slightly entangled solvent. A shear-enhanced concentration fluctuation prior to the disentanglement of polymers was found when increasing the shear rate continuously.