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This paper reports that a one-colour fs pump-probe measurement has been carried out for studying photoionization/photodissociation of cyclohexanone(CsH10O)in intense laser field.Two of the fragments from cyclohcxanone,C2H+3 and C3H+3,are studied under 800 nm laser pump-probe and the results obtained show similar time evolutions.It proposes a feasible model for analysing the experimental observations of the one-colour fs pump-probe measurement.The results demonstrate that as an intermediate product,the excited molecular parent ions play a very important role in photionization/photodissociation processes in intense laser field.