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Hard x-ray emission from fs laser produced plasmas have a number of interesting applications in the dynamic probing of matter and in medical/biological imaging.Betatron radiation is a collimated laser-driven hard x-ray source with fs duration which generated by electron transversely oscillation during acceleration in underdense plasmas.However,yield of this source is always limited by controdictory between parameters during electron acceleration.we will present our recent progress in enhancing the x-ray photon yield.