High strength concrete is concrete with special treatment that can’t be reached by using conventional material without adding the special addmixtures. High strength concrete need more cement compare to normal concrete thus fly ash need to be added to high strength concrete to reduce the amount of cement. The aim of this research is to study about the proper proportion for adding the additive (bestmittel) and fly ash on high strength concrete also to understand the effect of additional materials to the compressive strength of high strength concrete. Three variation sample with the form of cylinder with diameter 15 cm and 30 cm heigth were tested at the age of 28 days.compressive strength were affected by the adding the additive (bestmittel on the high strength concrete with fly ash. The more fly ash were using increase the compressive strength but will decrease the quality of the concrete if fly ash is too much added as the replacement of cement. The result from compressive strength with additional fly ash and additive (bestmittel) with variation 5%; 7,5%; and 10% were 35,95 MPa; 41,49 MPa; and 40,45 Mpa.