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Indonesia is the natural asphalt – Asbuton, a producer with the largest deposit in the world. One of the modified Asbutons produced in the form of Retona Blend asphalt 55 produced by PT. Olah Bumi Mandiri. Asbuton has the potential to be used as a binder on road pavement to replace oil asphalt that is commonly used. Beside natural asphalt, coal is also one of the natural resources in Indonesia which continue to be explored, causing fly ash waste. Furthermore, fly ash waste can be used as a cavity filler. The method used is Marshall in order to examine the effect characteristics of coal fly ash on a mixture of HRS-WC and AC-WC and Retona Blend 55 asphalt binder with varying levels of coal fly ash as a filler substitute with the content of 0%, 5%, 5.5%, 6%, and 6.5%. The results of Marshall characteristics using coal fly ash in a mixture of AC-WC and HRS-WC tend to increase in density, VFWA values. Meanwhile, the value of VIM and stability in the mixture of AC-WC and HRS-WC have decreased. Flow value in the AC-WC mixture tends to increase. The highest value of flow in AC-WC and HRS-WC at levels of 6.5%, namely 3.67 mm and 3.55 mm. The MQ value in the AC-WC and HRS-WC mixture has decreased with the highest MQ value in the mixture without using fly ash, i.e., 750.41 for HRS-WC and 655.07 for AC-WC