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We propose a compressed ghost imaging scheme based on differential speckle pattes, named CGI-DSP. In thescheme, a series of bucket detector signals are acquired when a series of random speckle pattes are employed to illumi-nate an unknown object. Then the differential speckle pattes (differential bucket detector signals) are obtained by taking the difference between present random speckle pattes (present bucket detector signals) and previous random speckle pat-tes (previous bucket detector signals). Finally, the image of object can be obtained directly by performing the compressed sensing algorithm on the differential speckle pattes and differential bucket detector signals. The experimental and sim-ulated results reveal that CGI-DSP can improve the imaging quality and reduce the number of measurements comparing with the traditional compressed ghost imaging schemes because our scheme can remove the environmental illuminations efficiently.