Lamprophyre dikes occur commonly in the Jiaodong ore cluster area. The altered lamprophyre rock is a good object to trace the geochemical characteristics of the alteration fluid. Two pairs of fresh and altered lamprophyre rocks were collected in the Linglong gold deposit on which 56 items of major oxides and trace elements were analyzed. The results indicate that the lamprophyre is rich in K₂O and the REE didn’t fractionate during the lamprophyre alteration in the Linglong gold deposit. Immobile plateau is a good method to determine the immobile elements during the lamprophyre alteration which overcomes the technical default of the Isocon method for fitting a line through the zero.