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Preliminary study on Modified CANLDE burnup strategy utilization in a helium cooled fast reactor have been performed. The Modified CANDLE burnup strategy is applied so that the reactor can operate using natural uranium fuel. Modified CANDLE burn-up strategy is applied in the radial direction because it is technically easier to implement. In modified CANDLE burnup strategy in radial direction, the active core is subdivided into ten regions with the same volume in the radial direction. When startup, each region contains fuel with different composition. The first region contains natural uranium (fresh fuel). The second region contains fuel from natural uranium burning for 10 years, the third region contains fuel from natural uranium burning for 20 years and so on. In this study, the Modified CANDLE burnup strategy in radial direction was designed using the MCNPX program. The fuel to be used is obtained from the calculation results of 2006 SRAC code system and FI ITB CH1 program. In the process, fuel will be shifted from one region to another until all regions are filled with new fuel. The result of calculation shows the reactor is in critical condition.